JS & DOM Reference

JavaScript Objects

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JS Date
JS Math
JS Number
JS String
JS RegExp
JS Functions

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JavaScript RegExp Object

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RegExp Object

A regular expression is an object that describes a pattern of characters.

Regular expressions are used to perform powerful pattern-matching and "search-and-replace" functions on text.

Syntax

var txt=new RegExp(pattern,modifiers);

or more simply:

var txt=/pattern/modifiers;

pattern specifies the pattern of an expression
modifiers specify if a search should be global, case-sensitive, etc.

Modifiers

F: Firefox, IE: Internet Explorer

Modifiers are used to perform case-insensitive and global searches:

Modifier	Description	F	IE
i	Perform case-insensitive matching	1	4
g	Perform a global match (find all matches rather than stopping after the first match)	1	4
m	Perform multiline matching	1	4

Brackets

Brackets are used to find a range of characters:

Expression	Description	F	IE
[abc]	Find any character between the brackets	1	4
[^abc]	Find any character not between the brackets	1	4
[0-9]	Find any digit from 0 to 9	1	4
[a-z]	Find any character from lowercase a to lowercase z	1	4
[A-Z]	Find any character from uppercase A to uppercase Z	1	4
[a-Z]	Find any character from lowercase a to uppercase Z	1	4
[adgk]	Find any character in the given set	1	4
[^adgk]	Find any character outside the given set	1	4
[red\|blue\|green]	Find any of the alternatives specified	1	4

Metacharacters

Metacharacters are characters with a special meaning:

Metacharacter	Description	F	IE
.	Find a single character, except newline or line terminator	1	4
\w	Find a word character	1	4
\W	Find a non-word character	1	4
\d	Find a digit	1	4
\D	Find a non-digit character	1	4
\s	Find a whitespace character	1	4
\S	Find a non-whitespace character	1	4
\b	Find a match at the beginning/end of a word	1	4
\B	Find a match not at the beginning/end of a word	1	4
\0	Find a NUL character	1	4
\n	Find a new line character	1	4
\f	Find a form feed character	1	4
\r	Find a carriage return character	1	4
\t	Find a tab character	1	4
\v	Find a vertical tab character	1	4
\xxx	Find the character specified by an octal number xxx	1	4
\xdd	Find the character specified by a hexadecimal number dd	1	4
\uxxxx	Find the Unicode character specified by a hexadecimal number xxxx	1	4

Quantifiers

Quantifier	Description	F	IE
n+	Matches any string that contains at least one n	1	4
n*	Matches any string that contains zero or more occurrences of n	1	4
n?	Matches any string that contains zero or one occurrences of n	1	4
n{X}	Matches any string that contains a sequence of X n's	1	4
n{X,Y}	Matches any string that contains a sequence of X or Y n's	1	4
n{X,}	Matches any string that contains a sequence of at least X n's	1	4
n$	Matches any string with n at the end of it	1	4
^n	Matches any string with n at the beginning of it	1	4
?=n	Matches any string that is followed by a specific string n	1	4
?!n	Matches any string that is not followed by a specific string n	1	4

RegExp Object Properties