Regular Expressions 101

Sponsors
Learn to code interactively with bite-sized, hands-on programming challenges.

Community Patterns

83

Distinguish torrent files (series vs movies)

Created·2014-06-26 09:59
Updated·2023-07-20 15:08
Flavor·Python
A neat regex for finding out whether a given torrent name is a series or a movie. Returns the full name of the series with the separator needed to make it pretty (ie, replace it with space or what you want). Also returns the season number or the year for the movie/series, depending on what was previously matched.
Submitted by Firas Dib
3

phone

Created·2015-05-07 17:14
Flavor·Python
matches: + example: +52 33 3884 7720 +1 770 343 5788
Submitted by miqui
9

Extract Protocol, URL, URL Path, get parameters and hash from URI

Created·2014-05-22 23:34
Flavor·Python
This is simplified from my last submission.
Submitted by Dale O'Brien
9

domain - host

Created·2015-09-29 17:50
Flavor·Python
no description available
Submitted by anonymous
7

CSS Import

Created·2014-05-03 00:51
Flavor·Python
no description available
Submitted by anonymous
13

Conventional Commits validation

Created·2022-01-03 20:30
Updated·2022-04-05 20:20
Flavor·Python
This regex prevents the writing of non-standard conventional commits. I'm available on my github
Submitted by Krisque
12

Find Reddit Threads

Created·2015-03-12 09:23
Flavor·Python
Simply searches for the thread-id in any kind of valid reddit-URL.
Submitted by Mio
1

Regular expression to remove all puncutation

Created·2014-06-20 07:18
Flavor·Python
Removes all of the puncutation present inlcuding \n,\t,\r
Submitted by Abhinav Gupta
11

extract subdomain(if available) or domain from URL

Created·2016-04-08 13:05
Flavor·Python
This regex should extract the subdomain, if any, or the domain, if no subdomain is used, from an arbitrary URL
Submitted by trevi@twanda.com
8

repeat group match

Created·2015-07-24 21:02
Flavor·Python
no description available
Submitted by anonymous
10

entity

Created·2015-11-20 01:12
Flavor·Python
no description available
Submitted by anonymous
9

English date in "dd mmmm yyyy" format

Created·2015-05-18 19:41
Flavor·Python
Parse an English date following the "dd mmmm yyyy" format.
Submitted by Tantale
4

Complete imgur link regex

Created·2015-03-13 11:26
Flavor·Python
This regex grabs all kinds of imgur links and groups them in meaningful names aswell. This way you have full flow-control in your python-scripts.
Submitted by Mio
5

Find consecutive duplicate words

Created·2015-08-31 22:17
Flavor·Python
no description available
Submitted by anonymous
7

IOS3166 Country Code Identification REGEX

Created·2015-06-07 04:48
Flavor·Python
IOS3166 Country Code Identification REGEX
Submitted by theitgeek@recu.org.uk
7

SO: fail2ban regular to find 403 request in nginx

Created·2014-09-15 11:32
Updated·2023-07-27 20:59
Flavor·Python
http://stackoverflow.com/q/25778420/2072035
Submitted by anonymous
3

date time

Created·2014-01-29 03:45
Flavor·Python
1/Jul/2013 03:27:12
Submitted by himel
1

dd/mm/yyyy validation regexp

Created·2015-09-17 10:54
Flavor·Python
no description available
Submitted by uknnown
2

postgesql

Created·2015-08-11 09:45
Flavor·Python
no description available
Submitted by anonymous
3

Twitch URL Regex

Created·2015-03-15 12:53
Flavor·Python
Can grab all kinds of valid twitch URLs.
Submitted by Mio
1

Parse a HTML URL

Created·2014-05-22 23:07
Flavor·Python
Break a URL into parts: protocol url path get parameters hash
Submitted by Dale O'Brien
4

Bible reference extractor

Created·2016-04-04 08:31
Flavor·Python
For scraping http://skepticsannotatedbible.com/
Submitted by antaytheist-owner
6

Find and extract email domain

Created·2016-04-03 17:03
Flavor·Python
Find and extract email domain. Ex: test@example.pt -> extract 'example.pt'
Submitted by Fnxk
1

REGEX

Created·2015-04-04 13:58
Flavor·Python
no description available
Submitted by anonymous
5

Match Only Text

Created·2016-07-05 03:56
Flavor·Python
no description available
Submitted by anonymous
5

psswd

Created·2016-03-24 09:04
Flavor·Python
no description available
Submitted by anonymous
5

Form Tag

Created·2016-02-26 06:49
Flavor·Python
Form Tag
Submitted by Jay Patel
5

import url image

Created·2015-12-18 08:44
Flavor·Python
import url image
Submitted by bartimeys
0

Get any word before specific string

Created·2015-09-05 06:41
Flavor·Python
no description available
Submitted by anonymous
-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
-1

woop

Created·2015-02-15 22:12
Flavor·Python
no description available
Submitted by anonymous
1

quoted string in VB.net format

Created·2014-05-20 11:06
Flavor·Python
Get all strings in vb.net format (even nested quotes"
Submitted by Alan Moore (http://stackoverflow.com/questions/2148587/finding-quoted-strings-with-escaped-quotes-in-c-sharp-using-a-regular-expression) modified by j
1

IPv4 extraction

Created·2014-04-04 13:05
Flavor·Python
no description available
Submitted by Jacob
-2

Between two strings

Created·2015-10-27 19:18
Flavor·Python
Awesome explanation of nested lookbacks
Submitted by OnlineCop
4

Equation matching (without equal)

Created·2015-07-01 19:50
Flavor·Python
use this to get value of any side of an equation. You can combine this with https://regex101.com/r/fH5kJ1/1
Submitted by Kerosene2000
3

prices in nis

Created·2015-06-15 15:16
Flavor·Python
no description available
Submitted by molaxx
1

States

Created·2015-05-06 17:38
Flavor·Python
States (US) 2 char format, matches: Ga or GA
Submitted by miqui
2

Find any digits in string

Created·2015-04-11 11:31
Flavor·Python
no description available
Submitted by anonymous
0

Find email address in a string.

Created·2014-06-11 17:57
Flavor·Python
no description available
Submitted by anonymous
-1

Twitter #hashtags

Created·2013-10-17 17:40
Flavor·Python
Using the twitter API, take a tweet object and find & link #tags to embed in HTML
Submitted by @triplec1988
3

Thorough UK Postcode Validator with In/Out code capture groups

Created·2016-09-30 15:51
Flavor·Python
A more thorough UK postcode validator tested against all UK postcodes on a regular basis, but excluding the special GIRO postcode case out of personal preference. Additionally has capture groups for the In-code and Out-code sections. Requires case insensitive matching.
Submitted by Chris G
3

Email

Created·2016-09-07 03:55
Flavor·Python
Python
Submitted by anonymous
3

Capture Query Strings

Created·2016-05-15 10:22
Flavor·Python
A solution for capture query params.
Submitted by Rafael Laurindo
2

Port validator

Created·2016-04-19 10:13
Flavor·Python
Validates port numbers from 1 to 65535
Submitted by Agustín Bouillet
2

match those lines whose first n chars contains 1+ non numeric

Created·2016-04-05 20:01
Flavor·Python
1100582367|SDFDSFDSFDSFDSFDF GBC213WREW|RWEFSDFSDF 1100582377|DSFDSFDSFDSF 2NDG.S.D BIKADSFDSFDSFNO.421 1100582387|SDFSDFSDFDSF
Submitted by sid
3

iframe src parser

Created·2016-01-05 12:41
Flavor·Python
Get iframe src
Submitted by Sumeet Fefar
-2

Email Validation

Created·2015-12-01 22:35
Flavor·Python
Full email validation with optional "." "-" "_"
Submitted by Jakub Stasiak
1

Address Match

Created·2015-11-16 15:43
Flavor·Python
no description available
Submitted by Awk
2

SED

Created·2015-11-12 15:42
Flavor·Python
no description available
Submitted by anonymous
1

json comment - first attempt

Created·2015-11-05 20:27
Flavor·Python
no description available
Submitted by Mark

Community Library Entry

1

Regular Expression
Created·2023-06-15 18:56
Flavor·Python

r"
<!DOCTYPE html>|</?\s*[a-z-][^>]*\s*>|(\&(?:[\w\d]+|#\d+|#x[a-f\d]+);|<!--[\s\S\n]*?-->)
"
g
Open regex in editor

Description

This would appear to violate the premise of this famous StackOverflow answer , however this is not parsing as such, only matching or heuristic identification.

Technically, all text is HTML if served to a browser in such a way that the browser chooses to interpret it that way, e.g. using a text/html Content-Type.

Submitted by Alice Bevan-mcgregor