JavaScript RegExp

February 8, 2021 10:45 am IST

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RegExp Modifiers

The following table provides a list of all RegExp modifiers available in JavaScript.

Modifier	Explanation
i	Perform case-insensitive match and returns the first match
g	Perform a global match and returns all matches
m	Perform multiline match and returns the first match

The following table provides a list of all RegExp brackets available in JavaScript.

Bracket	Explanation
[abc]	Finds any character(s) in/between the brackets
[^abc]	Finds any character NOT in/between the brackets
[0-9]	Finds any character (digit) in/between the brackets
[^0-9]	Finds any character (digit) NOT in/between the brackets
(x\|y)	Find any of the alternatives specified

The following table provides a list of all RegExp metacharacters available in JavaScript.

Metacharacter	Explanation
.	Matches any single character except the newline characters (\n, \r, etc.)
\w	Find a word character
\W	Find a non-word character
\d	Find a digit
\D	Find a non-digit character
\s	Find a whitespace character
\S	Find a non-whitespace character
\b	Finds a match at the beginning or end of a word
\B	Finds a match, but where it is NOT at the beginning/end of a word
\0	Finds a position (index value) of first occurrence of NUL character
\n	Finds a position (index value) of first occurrence of newline character
\f	Finds a position (index value) of first occurrence of form feed character
\r	Finds a position (index value) of first occurrence of carriage return character
\t	Finds a position (index value) of first occurrence of tab character
\v	Finds a position (index value) of first occurrence of vertical tab character
\ddd	Finds the Latin character specified by an octal number ddd
\xdd	Finds the Latin character specified by a hexadecimal number dd
\uxxxx	Finds the Unicode character specified by a hexadecimal number xxxx

The following table provides a list of all RegExp quantifiers available in JavaScript.

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

The following table provides a list of all RegExp properties available in JavaScript.

Property	Explanation
Constructor	Returns the function that created the RegExp object's prototype
global	Indicates whether the global match flag is specified or not
ignoreCase	Indicates whether the case-insensitive match flag is specified or not
lastIndex	Returns an integer that specifies the character position immediately following the last match
multiline	Indicates whether the multiline match flag is specified or not
source	Returns a string containing the source text of the regexp object

The following table provides a list of all RegExp methods available in JavaScript.

Method	Explanation
exec()	Tests for a match in a string and returns the first match
test()	Tests for a match in a string and returns true or false
toString()	Returns the string value of the regular expression