Let regex;
/* shorthand character classes */
regex = /d/; // matches any digit, short for [0-9]
regex = /D/; // matches non-digits, short for [^0-9]
regex = /S/; // matches non-white space character
regex = /s/; // matches any white space character
regex = /w/; // matches character, short for [a-zA-Z_0-9]
regex = /W/; // matches non-word character [^w]
regex = /b/; // Matches a word boundary where a word character is [a-zA-Z0-9_]
These meta characters boast a pre-defined meaning and make various typical patterns easier to use.
/* matching using quantifiers */
regex= /X./; // matches any character
regex= /X*/; // Matches zero or several repetitions of letter X, is short for {0,}
regex= /X+-/; // matches one or more repetitions of letter X, is short for {1,}
regex= /X?/; // finds no or exactly one letter X, is short for is short for {0,1}.
regex= // d{3}; // matches three digits. {} describes the order of the preceding liberal
regex= // d{1,4} ; // means d must occur at least once and at a maximum of four
A quantifies helps developers to define how often an element occurs.
/* character ranges */
regex = /[a-z]/; // matches all lowercase letters
regex = /[A-Z]/; // matches all uppercase letters
regex = /[e-l]/; // matches lowercase letters e to l (inclusive)
regex = /[F-P]/; // matches all uppercase letters F to P (inclusive)
regex = /[0-9]/; // matches all digits
regex = /[5-9]/; // matches any digit from 5 to 9 (inclusive)
regex = / [a-d1-7]/; // matches a letter between a and d and figures from 1 to 7, but not d1
regex = /[a-zA-Z]/; // matches all lowercase and uppercase letters
regex = /[^a-zA-Z]/; // matches non-letters
/* matching using anchors */
regex = / ^The/; // matches any string that starts with “The”
regex = / end$/; // matches a string that ends with end
regex = / ^The end$/; // exact string match starting with “The” and ending with “End”
/* escape characters */
regex = / a/; // match a bell or alarm
regex = / e/; // matches an escape
regex = / f/; // matches a form feed
regex = / n/; // matches a new line
regex = / Q…E/; // ingnores any special meanings in what is being matched
regex = / r/; // matches a carriage return
regex = / v/; // matches a vertical tab
It is critical to note that escape characters are case sensitive
/* matching using flags */
regex = / i/; // ignores the case in pattern ( upper and lower case allowed)
regex = / m/; // multi-line match
regex = / s/; // match new lines
regex = / x/; // allow spaces and comments
regex = / j/; // duplicate group names allowed
regex = / U/; // ungreedy match

Popularity 10/10 Helpfulness 3/10 Language javascript

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Tags: javascript regex

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Contributed on Jul 16 2021

jub0t

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regex /

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// replaces all / in a String with _
str = str.replace(/\//g,'_');

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Tags: javascript j

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Contributed on May 29 2020

Expensive Elk

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regexper

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oh my god, great tool to visualize your regular expression

Popularity 9/10 Helpfulness 2/10 Language whatever

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Contributed on Feb 09 2024

Nyxar - 2077

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regular expression

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^[a-zA-Z0-9.a-zA-Z0-9.!#$%&'*+-/=?^_`{|}~]+@[a-zA-Z0-9]+\.[a-zA-Z]+?((?:[a-zA-Z0-9-]{0,253}[a-zA-Z0-9])?)*$

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Contributed on Mar 03 2022

cmoulicms

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regex

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// "/^[a-zA-Z]+$/" 		for alphabetics;
// "/^[0-9]+$/" 		for numerics;
// "/^[a-zA-Z0-9]+$/" 	for alphanumerics;
// "/^\pL+$/u" 			for uni alphas;
// "/^\pN+$/u" 			for uni numerics;
// "/^[\pL\pN]+$/u"		for uni alphanumerics;

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Contributed on Sep 17 2022

Alijah Mckale Rodis

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Regular Expression

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-1

"^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[$@$!%*?&])[A-Za-z\d$@$!%*?&]{8,10}"

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Tags: expression e

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Contributed on Jan 16 2022

Enchanting Echidna

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Regex

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Great site to verify your regular expressions: https://regexr.com/

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Contributed on May 16 2022

Coder-Kyle

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regex pattern

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regex pattern

Only lowercase letters and numbers are allowed. Spaces are also not allowed
pattern="^[a-z0-9_\-]+$"


Must contain at least one number and one uppercase and lowercase letter, and at least 8 or more characters
pattern="(?=.*\d)(?=.*[a-z])(?=.*[A-Z]).{8,}"

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Contributed on Jun 07 2023

Bilal Ahmad

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regular expression

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/findme/
Characters \, ., \cX, \d, \D, \f, \n, \r, \s, \S, \t, \v, \w, \W, \0, \xhh, \uhhhh, \uhhhhh, [\b]	
Assertions 	^, $, x(?=y), x(?!y), (?<=y)x, (?<!y)x, \b, \B
Groups 		(x), (?:x), (?<Name>x), x|y, [xyz], [^xyz], \Number	
Quantifiers *, +, ?, x{n}, x{n,}, x{n,m}
Unicode \p{UnicodeProperty}, \P{UnicodeProperty}
javascript
let re = /findme/
let defaults = new RegExp('compiled'); 
defaults = { dotAll: false, flags: "", global: false, ignoreCase: false, falselastIndex: 0, multiline: false, source: "abc", sticky: false, unicode: false}

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Contributed on Nov 17 2020

Pink Person

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regex

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build your own regex:
https://regex101.com/

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Source: regex101.com

Tags: expression e

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Contributed on Aug 03 2022

hirohito

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regex

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