String

Package	Top Level
Class	public final class String
Inheritance	String Object

Runtime Versions:

Flash Player 9, AIR 1.0, Flash Lite 4

The String class is a data type that represents a string of characters. The String class provides methods and properties that let you manipulate primitive string value types. You can convert the value of any object into a String data type object using the String() function.

Because all string indexes are zero-based, the index of the last character for any string x is x.length - 1.

You can call any of the methods of the String class whether you use the constructor method new String() to create a new string variable or simply assign a string literal value. Unlike previous versions of ActionScript, it makes no difference whether you use the constructor, the global function, or simply assign a string literal value. The following lines of code are equivalent:

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 var str:String = new String("foo");
 var str:String = "foo";
 var str:String = String("foo");

When setting a string variable to undefined, the Flash runtimes coerce undefined to null. So, the statement:

 var s:String = undefined;

sets the value to null instead of undefined. Use the String() function if you need to use undefined.

View the examples

More examples

Creating strings
Working with characters in strings
Comparing strings
Concatenating strings
Finding substrings and patterns in strings
Converting strings between uppercase and lowercase
Strings example: ASCII art
Regular expression syntax

Learn more

Working with strings
Basics of strings

Related API Elements

String() global function

Public Properties

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Show Inherited Public Properties

	Property		Defined By
		constructor : Object A reference to the class object or constructor function for a given object instance.	Object
		length : int [read-only] An integer specifying the number of characters in the specified String object.	String

Public Methods

Hide Inherited Public Methods

Show Inherited Public Methods

	Method		Defined By
		String(val:String) Creates a new String object initialized to the specified string.	String
		charAt(index:Number = 0):String Returns the character in the position specified by the index parameter.	String
		charCodeAt(index:Number = 0):Number Returns the numeric Unicode character code of the character at the specified index.	String
		concat(... args):String Appends the supplied arguments to the end of the String object, converting them to strings if necessary, and returns the resulting string.	String
		fromCharCode(... charCodes):String [static] Returns a string comprising the characters represented by the Unicode character codes in the parameters.	String
		hasOwnProperty(name:String):Boolean Indicates whether an object has a specified property defined.	Object
		indexOf(val:String, startIndex:Number = 0):int Searches the string and returns the position of the first occurrence of val found at or after startIndex within the calling string.	String
		isPrototypeOf(theClass:Object):Boolean Indicates whether an instance of the Object class is in the prototype chain of the object specified as the parameter.	Object
		lastIndexOf(val:String, startIndex:Number = 0x7FFFFFFF):int Searches the string from right to left and returns the index of the last occurrence of val found before startIndex.	String
		localeCompare(other:String, ... values):int Compares the sort order of two or more strings and returns the result of the comparison as an integer.	String
		match(pattern:*):Array Matches the specifed pattern against the string.	String
		propertyIsEnumerable(name:String):Boolean Indicates whether the specified property exists and is enumerable.	Object
		replace(pattern:*, repl:Object):String Matches the specifed pattern against the string and returns a new string in which the first match of pattern is replaced with the content specified by repl.	String
		search(pattern:*):int Searches for the specifed pattern and returns the index of the first matching substring.	String
		setPropertyIsEnumerable(name:String, isEnum:Boolean = true):void Sets the availability of a dynamic property for loop operations.	Object
		slice(startIndex:Number = 0, endIndex:Number = 0x7fffffff):String Returns a string that includes the startIndex character and all characters up to, but not including, the endIndex character.	String
		split(delimiter:*, limit:Number = 0x7fffffff):Array Splits a String object into an array of substrings by dividing it wherever the specified delimiter parameter occurs.	String
		substr(startIndex:Number = 0, len:Number = 0x7fffffff):String Returns a substring consisting of the characters that start at the specified startIndex and with a length specified by len.	String
		substring(startIndex:Number = 0, endIndex:Number = 0x7fffffff):String Returns a string consisting of the character specified by startIndex and all characters up to endIndex - 1.	String
		toLocaleLowerCase():String Returns a copy of this string, with all uppercase characters converted to lowercase.	String
		toLocaleString():String Returns the string representation of this object, formatted according to locale-specific conventions.	Object
		toLocaleUpperCase():String Returns a copy of this string, with all lowercase characters converted to uppercase.	String
		toLowerCase():String Returns a copy of this string, with all uppercase characters converted to lowercase.	String
		toString():String Returns the string representation of the specified object.	Object
		toUpperCase():String Returns a copy of this string, with all lowercase characters converted to uppercase.	String
		valueOf():String Returns the primitive value of a String instance.	String

Property Detail

length

property

length:int [read-only]

Runtime Versions:

Flash Player 9, AIR 1.0, Flash Lite 4

An integer specifying the number of characters in the specified String object.

Because all string indexes are zero-based, the index of the last character for any string x is x.length - 1.

Implementation
public function get length():int

More examples

The length property

Constructor Detail

()

Constructor

public function String(val:String)

Runtime Versions:

Flash Player 9, AIR 1.0, Flash Lite 4

Creates a new String object initialized to the specified string.

Note: Because string literals use less overhead than String objects and are generally easier to use, you should use string literals instead of the String class unless you have a good reason to use a String object rather than a string literal.

Parameters

val:String — The initial value of the new String object.

More examples

Regular expression syntax

Method Detail

charAt

()

method

AS3 function charAt(index:Number = 0):String

Runtime Versions:

Flash Player 9, AIR 1.0, Flash Lite 4

Returns the character in the position specified by the index parameter. If index is not a number from 0 to string.length - 1, an empty string is returned.

This method is similar to String.charCodeAt() except that the returned value is a character, not a 16-bit integer character code.

Parameters

index:Number (default = 0) — An integer specifying the position of a character in the string. The first character is indicated by 0, and the last character is indicated by my_str.length - 1.

Returns

String — The character at the specified index. Or an empty string if the specified index is outside the range of this string's indices.

More examples

Working with characters in strings

Related API Elements

charCodeAt()

charCodeAt

()

method

AS3 function charCodeAt(index:Number = 0):Number

Runtime Versions:

Flash Player 9, AIR 1.0, Flash Lite 4

Returns the numeric Unicode character code of the character at the specified index. If index is not a number from 0 to string.length - 1, NaN is returned.

This method is similar to String.charAt() except that the returned value is a 16-bit integer character code, not the actual character.

Parameters

index:Number (default = 0) — An integer that specifies the position of a character in the string. The first character is indicated by 0, and the last character is indicated by my_str.length - 1.

Returns

Number — The Unicode character code of the character at the specified index. Or

NaN

if the index is outside the range of this string's indices.

Unicode values are defined in the Unicode Character Database specification.

More examples

Working with characters in strings

Related API Elements

charAt()

concat

()

method

AS3 function concat(... args):String

Runtime Versions:

Flash Player 9, AIR 1.0, Flash Lite 4

Appends the supplied arguments to the end of the String object, converting them to strings if necessary, and returns the resulting string. The original value of the source String object remains unchanged.

Parameters

... args — Zero or more values to be concatenated.

Returns

String — A new string consisting of this string concatenated with the specified parameters.

More examples

Concatenating strings

fromCharCode

()

method

AS3 static function fromCharCode(... charCodes):String

Runtime Versions:

Flash Player 9, AIR 1.0, Flash Lite 4

Returns a string comprising the characters represented by the Unicode character codes in the parameters.

Parameters

... charCodes — A series of decimal integers that represent Unicode values.

Unicode values are defined in the Unicode Character Database specification.

Returns

String — The string value of the specified Unicode character codes.

More examples

Working with characters in strings

indexOf

()

method

AS3 function indexOf(val:String, startIndex:Number = 0):int

Runtime Versions:

Flash Player 9, AIR 1.0, Flash Lite 4

Searches the string and returns the position of the first occurrence of val found at or after startIndex within the calling string. This index is zero-based, meaning that the first character in a string is considered to be at index 0--not index 1. If val is not found, the method returns -1.

Parameters

	`val:String` — The substring for which to search.

	`startIndex:Number` (default = `0`) — An optional integer specifying the starting index of the search.

Returns

int — The index of the first occurrence of the specified substring or -1.

More examples

Finding the character position of a matching substring

Related API Elements

lastIndexOf()

lastIndexOf

()

method

AS3 function lastIndexOf(val:String, startIndex:Number = 0x7FFFFFFF):int

Runtime Versions:

Flash Player 9, AIR 1.0, Flash Lite 4

Searches the string from right to left and returns the index of the last occurrence of val found before startIndex. The index is zero-based, meaning that the first character is at index 0, and the last is at string.length - 1. If val is not found, the method returns -1.

Parameters

	`val:String` — The string for which to search.

	`startIndex:Number` (default = `0x7FFFFFFF`) — An optional integer specifying the starting index from which to search for `val`. The default is the maximum value allowed for an index. If `startIndex` is not specified, the search starts at the last item in the string.

Returns

int — The position of the last occurrence of the specified substring or -1 if not found.

More examples

Finding the character position of a matching substring

Related API Elements

indexOf()

localeCompare

()

method

AS3 function localeCompare(other:String, ... values):int

Runtime Versions:

Flash Lite 4, Flash Player 9, AIR 1.0

Compares the sort order of two or more strings and returns the result of the comparison as an integer. While this method is intended to handle the comparison in a locale-specific way, the ActionScript 3.0 implementation does not produce a different result from other string comparisons such as the equality (==) or inequality (!=) operators. If the strings are equivalent, the return value is 0. If the original string value precedes the string value specified by other, the return value is a negative integer, the absolute value of which represents the number of characters that separates the two string values. If the original string value comes after other, the return value is a positive integer, the absolute value of which represents the number of characters that separates the two string values.

Parameters

	`other:String` — A string value to compare.

	`... values` — Optional set of more strings to compare.

Returns

int — The value 0 if the strings are equal. Otherwise, a negative integer if the original string precedes the string argument and a positive integer if the string argument precedes the original string. In both cases the absolute value of the number represents the difference between the two strings.

match

()

method

AS3 function match(pattern:*):Array

Runtime Versions:

Flash Lite 4, Flash Player 9, AIR 1.0

Matches the specifed pattern against the string.

Parameters

pattern:* — The pattern to match, which can be any type of object, but is typically either a string or a regular expression. If the pattern is not a regular expression or a string, then the method converts it to a string before executing.

Returns

Array — An array of strings consisting of all substrings in the string that match the specified pattern.

If pattern is a regular expression, in order to return an array with more than one matching substring, the g (global) flag must be set in the regular expression:

If the g (global) flag is not set, the return array will contain no more than one match, and the lastIndex property of the regular expression remains unchanged.
If the g (global) flag is set, the method starts the search at the beginning of the string (index position 0). If a matching substring is an empty string (which can occur with a regular expression such as /x*/), the method adds that empty string to the array of matches, and then continues searching at the next index position. The lastIndex property of the regular expression is set to 0 after the method completes.

When the pattern parameter is a regular expression with the g (global) flag set, if no match is found the method returns an empty Array. If the pattern parameter is a String or a non-global regular expression and no match is found, the method returns null. If you pass no value (or an undefined value) as the pattern parameter, the method returns null.

More examples

Finding patterns in strings and replacing substrings
Regular expression syntax

Related API Elements

RegExp

replace

()

method

AS3 function replace(pattern:*, repl:Object):String

Runtime Versions:

Flash Lite 4, Flash Player 9, AIR 1.0

Matches the specifed pattern against the string and returns a new string in which the first match of pattern is replaced with the content specified by repl. The pattern parameter can be a string or a regular expression. The repl parameter can be a string or a function; if it is a function, the string returned by the function is inserted in place of the match. The original string is not modified.

In the following example, only the first instance of "sh" (case-sensitive) is replaced:

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    var myPattern:RegExp = /sh/;  
    var str:String = "She sells seashells by the seashore.";
    trace(str.replace(myPattern, "sch"));  
       // She sells seaschells by the seashore.

In the following example, all instances of "sh" (case-sensitive) are replaced because the g (global) flag is set in the regular expression:

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    var myPattern:RegExp = /sh/g;  
    var str:String = "She sells seashells by the seashore.";
    trace(str.replace(myPattern, "sch"));  
       // She sells seaschells by the seaschore.

In the following example, all instance of "sh" are replaced because the g (global) flag is set in the regular expression and the matches are not case-sensitive because the i (ignoreCase) flag is set:

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    var myPattern:RegExp = /sh/gi;  
    var str:String = "She sells seashells by the seashore.";
    trace(str.replace(myPattern, "sch"));  
       // sche sells seaschells by the seaschore.

Parameters

pattern:* — The pattern to match, which can be any type of object, but it is typically either a string or a regular expression. If you specify a pattern parameter that is any object other than a string or a regular expression, the toString() method is applied to the parameter and the replace() method executes using the resulting string as the pattern.

repl:Object — Typically, the string that is inserted in place of the matching content. However, you can also specify a function as this parameter. If you specify a function, the string returned by the function is inserted in place of the matching content.

When you specify a string as the repl parameter and specify a regular expression as the pattern parameter, you can use the following special $ replacement codes in the repl string:

$ Code	Replacement Text
`$$`	`$`
`$&`	The matched substring.
$`	The portion of the string that precedes the matched substring. Note that this code uses the straight left single quote character (`), not the straight single quote character (') or the left curly single quote character (‘).
`$'`	The portion of string that follows the matched substring. Note that this code uses the straight single quote character (').
`$`n	The nth captured parenthetical group match, where n is a single digit 1-9 and `$`n is not followed by a decimal digit.
`$`nn	The nnth captured parenthetical group match, where nn is a two-digit decimal number (01-99). If the nnth capture is undefined, the replacement text is an empty string.

For example, the following shows the use of the $2 and $1 replacement codes, which represent the first and second capturing group matched:

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var str:String = "flip-flop";
    var pattern:RegExp = /(\w+)-(\w+)/g;
    trace(str.replace(pattern, "$2-$1")); // flop-flip

When you specify a function as the repl, the replace() method passes the following parameters to the function:

The matching portion of the string.
Any captured parenthetical group matches are provided as the next arguments. The number of arguments passed this way will vary depending on the number of parenthetical matches. You can determine the number of parenthetical matches by checking arguments.length - 3 within the function code.
The index position in the string where the match begins.
The complete string.

For example, consider the following:

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    var str1:String = "abc12 def34";
    var pattern:RegExp = /([a-z]+)([0-9]+)/;
    var str2:String = str1.replace(pattern, replFN);
    trace (str2);   // 12abc 34def
    
    function replFN():String {
      return arguments[2] + arguments[1];
    }

The call to the replace() method uses a function as the repl parameter. The regular expression (/([a-z]([0-9]/g) is matched twice. The first time, the pattern matches the substring "abc12", and the following list of arguments is passed to the function:

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    {"abc12", "abc", "12", 0, "abc12 def34"}

The second time, the pattern matches the substring "def23", and the following list of arguments is passed to the function:

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    {"def34", "def", "34", 6, "abc123 def34"}

Returns

String — The resulting string. Note that the source string remains unchanged.

More examples

Finding patterns in strings and replacing substrings
Regular expression syntax

Related API Elements

RegExp

search

()

method

AS3 function search(pattern:*):int

Runtime Versions:

Flash Lite 4, Flash Player 9, AIR 1.0

Searches for the specifed pattern and returns the index of the first matching substring. If there is no matching substring, the method returns -1.

Parameters

pattern:* — The pattern to match, which can be any type of object but is typically either a string or a regular expression.. If the pattern is not a regular expression or a string, then the method converts it to a string before executing. Note that if you specify a regular expression, the method ignores the global flag ("g") of the regular expression, and it ignores the lastIndex property of the regular expression (and leaves it unmodified). If you pass an undefined value (or no value), the method returns -1.

Returns

int — The index of the first matching substring, or -1 if there is no match. Note that the string is zero-indexed; the first character of the string is at index 0, the last is at string.length - 1.

More examples

Finding patterns in strings and replacing substrings
Regular expression syntax

Related API Elements

RegExp

slice

()

method

AS3 function slice(startIndex:Number = 0, endIndex:Number = 0x7fffffff):String

Runtime Versions:

Flash Lite 4, Flash Player 9, AIR 1.0

Returns a string that includes the startIndex character and all characters up to, but not including, the endIndex character. The original String object is not modified. If the endIndex parameter is not specified, then the end of the substring is the end of the string. If the character indexed by startIndex is the same as or to the right of the character indexed by endIndex, the method returns an empty string.

Parameters

	`startIndex:Number` (default = `0`) — The zero-based index of the starting point for the slice. If `startIndex` is a negative number, the slice is created from right-to-left, where -1 is the last character.

	`endIndex:Number` (default = `0x7fffffff`) — An integer that is one greater than the index of the ending point for the slice. The character indexed by the `endIndex` parameter is not included in the extracted string. If `endIndex` is a negative number, the ending point is determined by counting back from the end of the string, where -1 is the last character. The default is the maximum value allowed for an index. If this parameter is omitted, `String.length` is used.

Returns

String — A substring based on the specified indices.

More examples

Finding a substring by character position

Related API Elements

substr()
substring()

split

()

method

AS3 function split(delimiter:*, limit:Number = 0x7fffffff):Array

Runtime Versions:

Flash Lite 4, Flash Player 9, AIR 1.0

Splits a String object into an array of substrings by dividing it wherever the specified delimiter parameter occurs.

If the delimiter parameter is a regular expression, only the first match at a given position of the string is considered, even if backtracking could find a nonempty substring match at that position. For example:

     var str:String = "ab";
     var results:Array = str.split(/a*?/); // results == ["","b"]
     
     results = str.split(/a*/); // results == ["","b"].)

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If the delimiter parameter is a regular expression containing grouping parentheses, then each time the delimiter is matched, the results (including any undefined results) of the grouping parentheses are spliced into the output array. For example

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     var str:String = "Thi5 is a tricky-66 example.";
     var re:RegExp = /(\d+)/;
     var results:Array = str.split(re);
         // results == ["Thi","5"," is a tricky-","66"," example."]

If the limit parameter is specified, then the returned array will have no more than the specified number of elements.

If the delimiter is an empty string, an empty regular expression, or a regular expression that can match an empty string, each single character in the string is output as an element in the array.

If the delimiter parameter is undefined, the entire string is placed into the first element of the returned array.

Parameters

	`delimiter:*` — The pattern that specifies where to split this string. This can be any type of object but is typically either a string or a regular expression. If the `delimiter` is not a regular expression or string, then the method converts it to a string before executing.

	`limit:Number` (default = `0x7fffffff`) — The maximum number of items to place into the array. The default is the maximum value allowed.

Returns

Array — An array of substrings.

More examples

Creating an array of substrings segmented by a delimiter
Regular expression syntax

Related API Elements

Array.join()
RegExp

substr

()

method

AS3 function substr(startIndex:Number = 0, len:Number = 0x7fffffff):String

Runtime Versions:

Flash Lite 4, Flash Player 9, AIR 1.0

Returns a substring consisting of the characters that start at the specified startIndex and with a length specified by len. The original string is unmodified.

Parameters

	`startIndex:Number` (default = `0`) — An integer that specified the index of the first character to be used to create the substring. If `startIndex` is a negative number, the starting index is determined from the end of the string, where `-1` is the last character.

	`len:Number` (default = `0x7fffffff`) — The number of characters in the substring being created. The default value is the maximum value allowed. If `len` is not specified, the substring includes all the characters from `startIndex` to the end of the string.

Returns

String — A substring based on the specified parameters.

More examples

Finding a substring by character position

substring

()

method

AS3 function substring(startIndex:Number = 0, endIndex:Number = 0x7fffffff):String

Runtime Versions:

Flash Lite 4, Flash Player 9, AIR 1.0

Returns a string consisting of the character specified by startIndex and all characters up to endIndex - 1. If endIndex is not specified, String.length is used. If the value of startIndex equals the value of endIndex, the method returns an empty string. If the value of startIndex is greater than the value of endIndex, the parameters are automatically swapped before the function executes. The original string is unmodified.

Parameters

	`startIndex:Number` (default = `0`) — An integer specifying the index of the first character used to create the substring. Valid values for `startIndex` are `0` through `String.length`. If `startIndex` is a negative value, `0` is used.

	`endIndex:Number` (default = `0x7fffffff`) — An integer that is one greater than the index of the last character in the extracted substring. Valid values for `endIndex` are `0` through `String.length`. The character at `endIndex` is not included in the substring. The default is the maximum value allowed for an index. If this parameter is omitted, `String.length` is used. If this parameter is a negative value, `0` is used.

Returns

String — A substring based on the specified parameters.

More examples

Finding a substring by character position

toLocaleLowerCase

()

method

AS3 function toLocaleLowerCase():String

Runtime Versions:

Flash Lite 4, Flash Player 9, AIR 1.0

Returns a copy of this string, with all uppercase characters converted to lowercase. The original string is unmodified. While this method is intended to handle the conversion in a locale-specific way, the ActionScript 3.0 implementation does not produce a different result from the toLowerCase() method.

Returns

String — A copy of this string with all uppercase characters converted to lowercase.

Related API Elements

toLowerCase()

toLocaleUpperCase

()

method

AS3 function toLocaleUpperCase():String

Runtime Versions:

Flash Lite 4, Flash Player 9, AIR 1.0

Returns a copy of this string, with all lowercase characters converted to uppercase. The original string is unmodified. While this method is intended to handle the conversion in a locale-specific way, the ActionScript 3.0 implementation does not produce a different result from the toUpperCase() method.

Returns

String — A copy of this string with all lowercase characters converted to uppercase.

Related API Elements

toUpperCase()

toLowerCase

()

method

AS3 function toLowerCase():String

Runtime Versions:

Flash Lite 4, Flash Player 9, AIR 1.0

Returns a copy of this string, with all uppercase characters converted to lowercase. The original string is unmodified.

This method converts all characters (not simply A-Z) for which Unicode lowercase equivalents exist:

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     var str:String = " JOSÉ BARÇA";
     trace(str.toLowerCase()); // josé barça

These case mappings are defined in the Unicode Character Database specification.

Returns

String — A copy of this string with all uppercase characters converted to lowercase.

More examples

Converting strings between uppercase and lowercase

Related API Elements

toUpperCase()

toUpperCase

()

method

AS3 function toUpperCase():String

Runtime Versions:

Flash Lite 4, Flash Player 9, AIR 1.0

Returns a copy of this string, with all lowercase characters converted to uppercase. The original string is unmodified.

This method converts all characters (not simply a-z) for which Unicode uppercase equivalents exist:

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     var str:String = "José Barça";
     trace(str.toUpperCase()); // JOSÉ BARÇA

These case mappings are defined in the Unicode Character Database specification.

Returns

String — A copy of this string with all lowercase characters converted to uppercase.

More examples

Converting strings between uppercase and lowercase

Related API Elements

toLowerCase()

valueOf

()

method

AS3 function valueOf():String

Language Version:

ActionScript 3.0

Runtime Versions:

Flash Lite 4, Flash Player 9, AIR 1.0

Returns the primitive value of a String instance. This method is designed to convert a String object into a primitive string value. Because Flash runtimes automatically call valueOf() when necessary, you rarely need to call this method explicitly.

Returns

String — The value of the string.

Examples How to use this example

StringExample.as

The following example uses the StringExample and StringHelper classes to show how various methods of the String class are used. This is accomplished using the following steps:

The constructor for StringExample declares several local String instances, which are initialized with various strings and a new StringHelper object.
The StringHelper class has the following methods:
- replace(): calls the split() and join() methods of String to remove a substring of the string passed in with a new one.
- trim(): calls both trimBack() and trimFront() using the strings passed in and returns the updated string.
- trimFront():recursively removes all characters that match the char parameter, starting from the front of the string and working toward the end, until the first character in the string does not match char and returns the updated string.
- trimBack(): recursively removes all characters that match the char parameter, starting from the end of the string and working backward, until the last character in the string does not match char and returns the updated string.
- stringToCharacter(): returns the first character of the string passed to it.
Three strings are then produced using the declared string variables with a call to the replace() method used to produce the second string and trim() to produce the third string.

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package {
    import flash.display.Sprite;

    public class StringExample extends Sprite {
        public function StringExample() {
            var companyStr:String = new String("     Company X");
            var productStr:String = "Product Z Basic     ";
            var emptyStr:String = " ";
            var strHelper:StringHelper = new StringHelper();

            var companyProductStr:String = companyStr + emptyStr + productStr;
            trace("'" + companyProductStr + "'");    // '     Company X Product Z Basic     '

            companyProductStr = strHelper.replace(companyProductStr, "Basic", "Professional");
            trace("'" + companyProductStr + "'");    // '     Company X Product Z Professional     '

            companyProductStr = strHelper.trim(companyProductStr, emptyStr);
            trace("'" + companyProductStr + "'");    // 'Company X Product Z Professional'
        }
    }
}

class StringHelper {
    public function StringHelper() {
    }

    public function replace(str:String, oldSubStr:String, newSubStr:String):String {
        return str.split(oldSubStr).join(newSubStr);
    }

    public function trim(str:String, char:String):String {
        return trimBack(trimFront(str, char), char);
    }

    public function trimFront(str:String, char:String):String {
        char = stringToCharacter(char);
        if (str.charAt(0) == char) {
            str = trimFront(str.substring(1), char);
        }
        return str;
    }

    public function trimBack(str:String, char:String):String {
        char = stringToCharacter(char);
        if (str.charAt(str.length - 1) == char) {
            str = trimBack(str.substring(0, str.length - 1), char);
        }
        return str;
    }

    public function stringToCharacter(str:String):String {
        if (str.length == 1) {
            return str;
        }
        return str.slice(0, 1);
    }
}

String - AS3

Classes x

length

String

charAt

charCodeAt

concat

fromCharCode

indexOf

lastIndexOf

localeCompare

match

replace

search

slice

split

substr

substring

toLocaleLowerCase

toLocaleUpperCase

toLowerCase

toUpperCase

valueOf

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