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JS Reference
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JS Boolean
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JS String
JS RegExp
JS Functions
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JavaScript RegExp Object Reference

The RegExp Object

The regular expression object describes a pattern of characters.

Syntax for creating a RegExp object:

var txt=new RegExp(pattern,attributes);

or

var txt=/pattern/attributes;

pattern specifies the pattern of the regular expression
attributes specifies global ("g"), case-insensitive ("i"), and multiline matches ("m")

RegExp Object Properties

FF: Firefox, N: Netscape, IE: Internet Explorer

Property	Description	FF	N	IE
global	Specifies if the "g" modifier is set	1	4	4
ignoreCase	Specifies if the "i" modifier is set	1	4	4
input	The string on which the pattern match is performed	1	4	4
lastIndex	An integer specifying the index at which to start the next match	1	4	4
lastMatch	The last matched characters	1	4	4
lastParen	The last matched parenthesized substring	1	4	4
leftContext	The substring in front of the characters most recently matched	1	4	4
multiline	Specifies if the "m" modifier is set	1	4	4
prototype	Allows you to add properties and methods to the object	1	4	4
rightContext	The substring after the characters most recently matched	1	4	4
source	The text used for pattern matching	1	4	4

RegExp Object Methods

Method	Description	FF	N	IE
compile()	Change the regular expression	1	4	4
exec()	Search a string for a specified value. Returns the found value and remembers the position	1	4	4
test()	Search a string for a specified value. Returns true or false	1	4	4

String Object Methods that supports Regular Expressions

Method	Description	FF	N	IE
search()	Search a string for a specified value. Returns the position of the value	1	4	4
match()	Search a string for a specified value. Returns an array of the found value(s)	1	4	4
replace()	Replace characters with other characters	1	4	4
split()	Split a string into an array of strings	1	4	4

RegExp Modifiers

Modifier	Description	FF	N	IE
i	Perform case-insensitive matching	1	4	4
g	Perform a global match. Find all matches (do not stop after the first match)	1	4	4
gi	Perform a global case-insensitive match. Find all matches (do not stop after the first match)	1	4	4
m	Perform multiline matching	1	4	4

RegExp Modifiers

Property	Description	FF	N	IE
Position Matching
^	Get a match at the beginning of a string	1	4	4
$	Get a match at the end of a string	1	4	4
\b	Word boundary. Get a match at the beginning or end of a word in the string	1	4	4
\B	Non-word boundary. Get a match when it is not at the beginning or end of a word in the string	1	4	4
?=	A positive look ahead. Get a match if a string is followed by a specific string	1	4	4
?!	A negative look ahead. Get a match if a string is not followed by a specific string	1	4	4
Literals
\0	Find a NULL character	1	4	4
\n	Find a new line character	1	4	4
\f	Find a form feed character	1	4	4
\r	Find a carriage return character	1	4	4
\t	Find a tab character	1	4	4
\v	Find a vertical tab character	1	4	4
\xxx	Find the ASCII character expressed by the octal number xxx	1	4	4
\xdd	Find the ASCII character expressed by the hex number dd	1	4	4
\uxxxx	Find the ASCII character expressed by the UNICODE xxxx	1	4	4
Character Classes
[xyz]	Find any character in the specified character set	1	4	4
[^xyz]	Find any character not in the specified character set	1	4	4
. (dot)	Find any character except newline or line terminator	1	4	4
\w	Find any alphanumeric character including the underscore	1	4	4
\W	Find any non-word character	1	4	4
\d	Find any single digit	1	4	4
\D	Find any non-digit	1	4	4
\s	Find any single space character	1	4	4
\S	Find any single non-space character	1	4	4
Repetition
{x}	Finds the exact (x) number of the regular expression grouped together	1	4	4
{x,}	Finds the exact (x) or more number of the regular expression grouped together	1	4	4
{x,y}	Finds between x and y number of the regular expression grouped together	1	4	4
?	Finds zero or one occurrence of the regular expression	1	4	4
*	Finds zero or more occurrences of the regular expression	1	4	4
+	Finds one or more occurrences of the regular expression	1	4	4
Grouping
( )	Finds the group of characters inside the parentheses and stores the matched string	1	4	4
(?: )	Finds the group of characters inside the parentheses but does not store the matched string	1	4	4
\|	Combines clauses into one regular expression and then matches any of the individual clauses. Similar to "OR" statement	1	4	4
Back references
( )\n	Back reference. Uses the stored matched string. i.e. from the ( ) modifier	1	4	4

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