Regular Expressions 101

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Community Patterns

-18

dd-mm-YYYY HH:mm:ss (year range 1000-2999)

Created·2013-05-13 22:48
Updated·2023-07-24 16:28
Flavor·PCRE (Legacy)
Validate Gregorian calendar dates that contain 24-hour times. This will also correctly match the Feb 29 date when it falls on a valid leap year. Leap years occur every 4 years, with one exception: when a year is evenly divisible by 100 but not evenly divisible by 400, the year will not be a leap year. Thus years 2100, 2200, and 2300 are not leap years but years 2000, 2400, and 2800 are.
Submitted by Ka.
-6

Date with this format YYYY-MM-DD and year start 20 or 21

Created·2014-02-11 10:22
Flavor·PCRE (Legacy)
Date with this format YYYY-MM-DD and year start 20 or 21 like 2014
Submitted by cisc0
-4

Latitude/longitude tester

Created·2014-04-29 11:33
Flavor·PCRE (Legacy)
Tests the string if it does contain valid latitude and longitude parameters
Submitted by Doro
-3

Working With Data regex sample text

Created·2021-10-27 18:45
Flavor·PCRE2 (PHP)
This is a sample text for use at my "Working With Data" workshop session on regular expressions.
Submitted by anonymous
-3

Xml Parser (improved description)

Created·2016-05-19 22:30
Flavor·PCRE (Legacy)
]+)\s()\s(?:\/>|>(.)) - (with global) finds all tags in scope 1st group is tagname 2nd group is attributes 3rd group (if it exists) is value of the tag Apply pattern again on 3th group to find internal tags (recurse in the code to parse entire xml!) Apply pattern below on 2nd group to find all attributes: \s+(+)\s=\s"(*)" - (with global) finds attributes 1st group is attributename 2nd group is attributevalue
Submitted by veryanonymous
-3

IPv4 address

Created·2016-04-06 17:12
Flavor·Python
Matches any IPv4 address
Submitted by anonymous
-3

Regex Include & Exclude

Created·2016-01-26 19:36
Flavor·PCRE (Legacy)
Exclude part of a string in an include string.
Submitted by anonymous
-3

TD data from html table

Created·2015-12-24 10:15
Flavor·Python
no description available
Submitted by Deepak Bansal
-3

retrieve hostname without subdomain

Created·2015-11-19 00:55
Flavor·PCRE (Legacy)
no description available
Submitted by Diego Zuluaga
-3

Remove special character at first position of string

Created·2015-11-06 23:27
Flavor·PCRE (Legacy)
This search for special character at first position in the string
Submitted by anonymous
-3

matching words between tags

Created·2015-09-22 15:10
Flavor·JavaScript
matching words between square brachets tags include newline or carriage return
Submitted by anonymous
-3

Clean empty tags from HTML tags incl. tags containing space(s)

Created·2015-09-18 13:34
Flavor·PCRE (Legacy)
no description available
Submitted by anonymous
-3

Html Tags

Created·2015-09-10 09:06
Flavor·JavaScript
Matches HTML structure
Submitted by sagar
-3

get table name from mapfile

Created·2015-09-01 15:38
Flavor·PCRE (Legacy)
gets a postgis tablename from a mapfile with the given layer name, may not work depending on your mapfile layout
Submitted by warnock
-3

Replace abba with ABBA

Created·2015-08-30 10:24
Flavor·PCRE (Legacy)
no description available
Submitted by anonymous
-3

Facebook url regex

Created·2015-07-23 09:49
Flavor·PCRE (Legacy)
no description available
Submitted by Devs Devaras
-3

a

Created·2015-07-17 20:10
Flavor·PCRE (Legacy)
a
Submitted by a
-3

UpperCase words

Created·2015-07-15 16:06
Flavor·PCRE (Legacy)
no description available
Submitted by ivo
-3

ipv4 - short version

Created·2015-07-15 08:26
Flavor·PCRE (Legacy)
no description available
Submitted by gromozeka
-3

Telephone

Created·2015-06-16 14:32
Flavor·PCRE (Legacy)
Find Telephone
Submitted by Mr.Fail
-3

RegEX for account code starting with 000-

Created·2015-06-15 17:55
Flavor·PCRE (Legacy)
no description available
Submitted by Joe H
-3

Matches percentage with any number of digits

Created·2015-06-10 19:26
Flavor·Python
Only captures value for converting percentage to decimal. Returns empty if percentage but no value. no match = no percentage found
Submitted by sharkey
-3

Match email addresses and get the mail provider as a group

Created·2015-06-10 18:23
Flavor·PCRE (Legacy)
no description available
Submitted by Ole
-3

remove facebook urls from html

Created·2015-06-03 01:35
Flavor·JavaScript
This will remove all facebook urls from a HTML string
Submitted by Russell Miller
-3

Select a HTML table and all its innerHTML

Created·2015-04-15 19:49
Flavor·PCRE (Legacy)
no description available
Submitted by @ixzy24
-3

Strict email validation

Created·2015-02-28 10:35
Flavor·JavaScript
no description available
Submitted by anonymous
-3

Detect a numeric string

Created·2015-01-08 22:59
Flavor·JavaScript
no description available
Submitted by Ankur Chauhan
-3

mama

Created·2014-08-22 02:48
Flavor·PCRE (Legacy)
no description available
Submitted by anonymous
-3

Match substitutions

Created·2014-07-26 13:32
Flavor·Python
Match regular expressions substitutions, I personally use this to perform my validate if it is a substitution, then call re.sub() on it.
Submitted by Zarthus
-3

Number

Created·2014-07-13 16:14
Flavor·JavaScript
Gets all numbers in a string. This includes positive and negative numbers aswell as integers and floats. By: http://www.benlorantfy.com/
Submitted by Ben
-3

regex help

Created·2014-06-18 21:07
Flavor·PCRE (Legacy)
help please. i need regex,
Submitted by James
-3

British Postcode Check

Created·2014-05-15 13:46
Flavor·PCRE (Legacy)
no description available
Submitted by guest
-3

british postcode check

Created·2014-05-15 13:45
Flavor·PCRE (Legacy)
no description available
Submitted by anonymous
-3

Date and Time

Created·2014-03-25 16:35
Flavor·PCRE (Legacy)
no description available
Submitted by anonymous
-2

Codeforces 1800A Solution

Created·2023-07-24 16:01
Flavor·JavaScript
By inserting this regex in a programming language to test it against Codeforces 1800A you'll solve the task
Submitted by EntityPlantt
-2

Ascending and Descending order

Created·2023-07-17 15:51
Flavor·Java
This regex is to match Ascending or descending order of 8 digit number
Submitted by anonymous
-2

rustyms: pro forma single modification

Created·2023-06-21 21:59
Flavor·Rust
The regex to match a single pro forma modification with all its intricacies.
Submitted by Douwe Schulte
-2

Iranian Mobile Numbers

Created·2023-06-11 10:41
Flavor·PCRE2 (PHP)
To Validate Iranian Operators Number Validation
Submitted by AMAISGOD
-2

PHP Serialization String Validator

Created·2023-03-03 06:10
Flavor·PCRE (Legacy)
PHP serialize / unserialize __sleep __wakeup __serialize __unserialize
Submitted by Abdullah Pazarbasi
-2

Parsing result of SQL Server version (SELECT @@VERSION)

Created·2023-02-15 21:12
Flavor·.NET 7.0 (C#)
Parses MS SQL Server version returned from executing SELECT @@version
Submitted by M Rivas
-2

Match whitespace and colon, except in specific words

Created·2022-08-10 15:21
Flavor·JavaScript
For string splitting / deconstructing
Submitted by anonymous
-2

Conventional Commits commit regex

Created·2022-01-31 00:53
Flavor·PCRE2 (PHP)
https://www.conventionalcommits.org/en/v1.0.0/
Submitted by Michael Collins
-2

Quizzes Feedpager – XML

Created·2022-01-27 13:30
Flavor·PCRE (Legacy)
Matches the XML pages of the /quizzes routes for feedpager
Submitted by anonymous
-2

smargs

Created·2021-03-16 00:05
Flavor·PCRE2 (PHP)
smargs not margins
Submitted by rkatz
-2

From conf table to hive table

Created·2021-02-18 19:33
Flavor·PCRE2 (PHP)
no description available
Submitted by anonymous
-2

LinuxOSVersion

Created·2021-02-16 10:33
Flavor·PCRE2 (PHP)
no description available
Submitted by anonymous
-2

Exclude particular word in phrase

Created·2021-02-16 08:53
Flavor·PCRE2 (PHP)
this will exclude particular phrase from a line. means it will match only those line which dont have those word
Submitted by anonymous
-2

Url regex

Created·2021-02-14 19:11
Flavor·PCRE2 (PHP)
no description available
Submitted by anonymous
-2

Eide Chrysler New Goal

Created·2021-02-02 00:42
Updated·2021-02-02 00:44
Flavor·PCRE2 (PHP)
no description available
Submitted by anonymous
-2

Answer to 10

Created·2020-07-24 21:24
Flavor·PCRE (Legacy)
no description available
Submitted by anonymous

Community Library Entry

1

Regular Expression
Created·2026-07-01 16:48
Flavor·PCRE2 (PHP)

/
((?![^<>]*>)(?:(?:(?:(?:(?:H[eogsf]?|L[iavru]|B[eahkri]?|C[arofmusenld]?|N[eiahopdb]?|O[sg]?|F[rlem]?|M[godtcn]|A[lrsgutmc]|S[icerngmb]?|P[uabotmrd]?|Kr?|T[icebmsalh]|V|Z[nr]|G[ade]|R[buhenagf]|Yb?|I[nr]?|Xe|E[urs]|D[ysb]|W|U)|[()\\[\\]])+(?:(?:(?:[₁₂₃₄₅₆₇₈₉][₀₁₂₃₄₅₆₇₈₉]*|[¹²³⁴⁵⁶⁷⁸⁹][⁰¹²³⁴⁵⁶⁷⁸⁹]*|\\u208[1-9](?:\\u208[0-9])*|(?:\\u00[bB][239]|\\u207[4-9])(?:\\u2070|\\u00[bB][239]|\\u207[4-9])*|&#(?:0*832[1-9]|[xX]0*208[1-9]);(?:&#(?:0*832[0-9]|[xX]0*208[0-9]);)*|&#(?:0*(?:178|179|185|830[89]|831[0-3])|[xX]0*(?:[bB][239]|207[4-9]));(?:&#(?:0*(?:178|179|185|8304|830[89]|831[0-3])|[xX]0*(?:2070|[bB][239]|207[4-9]));)*|<su[bp]>[1-9][0-9]*<\/su[bp]>)|[1-9][0-9]*))*)){2,}|(?:(?:H[eogsf]?|L[iavru]|B[eahkri]?|C[arofmusenld]?|N[eiahopdb]?|O[sg]?|F[rlem]?|M[godtcn]|A[lrsgutmc]|S[icerngmb]?|P[uabotmrd]?|Kr?|T[icebmsalh]|V|Z[nr]|G[ade]|R[buhenagf]|Yb?|I[nr]?|Xe|E[urs]|D[ysb]|W|U)|[()\\[\\]])+(?:[₁₂₃₄₅₆₇₈₉][₀₁₂₃₄₅₆₇₈₉]*|[¹²³⁴⁵⁶⁷⁸⁹][⁰¹²³⁴⁵⁶⁷⁸⁹]*|\\u208[1-9](?:\\u208[0-9])*|(?:\\u00[bB][239]|\\u207[4-9])(?:\\u2070|\\u00[bB][239]|\\u207[4-9])*|&#(?:0*832[1-9]|[xX]0*208[1-9]);(?:&#(?:0*832[0-9]|[xX]0*208[0-9]);)*|&#(?:0*(?:178|179|185|830[89]|831[0-3])|[xX]0*(?:[bB][239]|207[4-9]));(?:&#(?:0*(?:178|179|185|8304|830[89]|831[0-3])|[xX]0*(?:2070|[bB][239]|207[4-9]));)*|<su[bp]>[1-9][0-9]*<\/su[bp]>))(?:[+-](?![A-Za-z0-9]))?(?:(?:\\s*[·•‧∙⋅・･*]\\s*|\\.(?=[A-Za-z(\\[]))(?:(?:(?:[₁₂₃₄₅₆₇₈₉][₀₁₂₃₄₅₆₇₈₉]*|[¹²³⁴⁵⁶⁷⁸⁹][⁰¹²³⁴⁵⁶⁷⁸⁹]*|\\u208[1-9](?:\\u208[0-9])*|(?:\\u00[bB][239]|\\u207[4-9])(?:\\u2070|\\u00[bB][239]|\\u207[4-9])*|&#(?:0*832[1-9]|[xX]0*208[1-9]);(?:&#(?:0*832[0-9]|[xX]0*208[0-9]);)*|&#(?:0*(?:178|179|185|830[89]|831[0-3])|[xX]0*(?:[bB][239]|207[4-9]));(?:&#(?:0*(?:178|179|185|8304|830[89]|831[0-3])|[xX]0*(?:2070|[bB][239]|207[4-9]));)*|<su[bp]>[1-9][0-9]*<\/su[bp]>)|[1-9][0-9]*(?:\/[1-9][0-9]*)?|[xn]))?(?:(?:(?:H[eogsf]?|L[iavru]|B[eahkri]?|C[arofmusenld]?|N[eiahopdb]?|O[sg]?|F[rlem]?|M[godtcn]|A[lrsgutmc]|S[icerngmb]?|P[uabotmrd]?|Kr?|T[icebmsalh]|V|Z[nr]|G[ade]|R[buhenagf]|Yb?|I[nr]?|Xe|E[urs]|D[ysb]|W|U)|[()\\[\\]])+(?:(?:(?:[₁₂₃₄₅₆₇₈₉][₀₁₂₃₄₅₆₇₈₉]*|[¹²³⁴⁵⁶⁷⁸⁹][⁰¹²³⁴⁵⁶⁷⁸⁹]*|\\u208[1-9](?:\\u208[0-9])*|(?:\\u00[bB][239]|\\u207[4-9])(?:\\u2070|\\u00[bB][239]|\\u207[4-9])*|&#(?:0*832[1-9]|[xX]0*208[1-9]);(?:&#(?:0*832[0-9]|[xX]0*208[0-9]);)*|&#(?:0*(?:178|179|185|830[89]|831[0-3])|[xX]0*(?:[bB][239]|207[4-9]));(?:&#(?:0*(?:178|179|185|8304|830[89]|831[0-3])|[xX]0*(?:2070|[bB][239]|207[4-9]));)*|<su[bp]>[1-9][0-9]*<\/su[bp]>)|[1-9][0-9]*))*)+(?:[+-](?![A-Za-z0-9]))?)*)
/
gmu
Open regex in editor

Description

Parses for formulas using glyph, unicode or sub/sup tags for the subscripts. TS script here (with screenshot)

Submitted by Justin Hyland