Regular Expressions 101

Sponsors
There are currently no sponsors. Become a sponsor today!

Community Patterns

485

regex101.com permalink id grabber

Created·2013-12-12 13:09
Updated·2024-04-11 14:32
Flavor·PCRE (Legacy)
Grabs the ID for the regex101.com permalink code. If a revision number is provided, grab that as well.
Submitted by chris mccoy
238

Matching email addresses per RFC5322

Created·2013-10-23 17:46
Flavor·PCRE (Legacy)
The BNF rules from RFC 5322 transformed to PCRE by Nikita Popov and described in the post http://nikic.github.io/2012/06/15/The-true-power-of-regular-expressions.html.
Submitted by Michael Musson
107

ECMAScript/JavaScript trim

Created·2013-09-10 08:21
Updated·2024-09-19 14:38
Flavor·ECMAScript (JavaScript)
Trim leading and trailing whitespace from a string.
Submitted by fp
73

Regex for telephone numbers all over the world

Created·2014-04-08 07:58
Updated·2023-10-09 14:47
Flavor·ECMAScript (JavaScript)
Recommended·
Detects most of the phone numbers all over the world
Submitted by Aditya Joshi
41

URL regexp

Created·2013-01-14 17:52
Flavor·PCRE (Legacy)
A quite neat regular expression for URLs, e-mails..., I found on Matthew O'Riordan's blog.
Submitted by Matthew O'Riordan
19

Date: DD-MM-YYYY hh:mm:ss

Created·2013-05-17 13:07
Flavor·PCRE (Legacy)
Recommended·
Validate and capture dateTime parts, includes validation for leap years, range 1000-2999. Fixed bug
Submitted by Ka.
87

Password Validation

Created·2015-07-08 18:46
Flavor·ECMAScript (JavaScript)
Checks that a password has a minimum of 6 characters, at least 1 uppercase letter, 1 lowercase letter, and 1 number with no spaces.
Submitted by Christian Klemp
35

http://

Created·2014-03-26 06:44
Flavor·PCRE (Legacy)
no description available
Submitted by Mitus M.
53

Disorted Email Addresses

Created·2013-01-16 14:11
Flavor·PCRE (Legacy)
Matches distorted email addresses and converts them back to real ones.
Submitted by dislick
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
6

Password

Created·2013-12-06 14:02
Updated·2023-07-21 04:59
Flavor·ECMAScript (JavaScript)
no description available
Submitted by anonymous
31

Email address (most used)

Created·2015-07-01 09:32
Flavor·ECMAScript (JavaScript)
Email address, most used cases
Submitted by Jago
35

Google like regex

Created·2014-05-12 13:35
Flavor·ECMAScript (JavaScript)
Attempts to mimic Google search box behavior, returning an array with the separated search strings (that keep the +/- indicator for following operations)
Submitted by mettjus
18

Email validation

Created·2014-09-16 13:45
Flavor·PCRE (Legacy)
no description available
Submitted by tutsplus.com
16

Alphanumeric Regex

Created·2015-06-15 13:57
Flavor·PCRE (Legacy)
no description available
Submitted by Deepan
4

Phone number

Created·2015-06-23 19:15
Flavor·PCRE (Legacy)
no description available
Submitted by Mark Landry
14

Phone Number

Created·2015-08-11 17:07
Flavor·ECMAScript (JavaScript)
Allows phone numbers with optional country code, optional special characters and whitespace
Submitted by Tlmader
26

match valid JSON

Created·2014-11-17 20:47
Flavor·PCRE (Legacy)
Matches any valid JSON object, matches recursively. Passes all JSON test cases I found.
Submitted by Mateon1
16

Password

Created·2015-04-28 16:49
Flavor·ECMAScript (JavaScript)
Safe Password that allow only with a number, a lowercase, a uppercase, and a special character
Submitted by davidlondono
23

userName

Created·2015-06-06 08:00
Flavor·PCRE (Legacy)
1-15 alphanumeric login name
Submitted by gsanchezc
29

CSV line parsing

Created·2014-10-15 13:22
Flavor·PCRE (Legacy)
Captures all fields from a CSV file's line. Can be customized with user-defined field separator and protecting character.
Submitted by Various
35

IP Address validator

Created·2015-06-18 12:52
Flavor·ECMAScript (JavaScript)
Validates IPv4 IP Address
Submitted by krzysp
31

ninite

Created·2015-09-29 11:28
Flavor·PCRE (Legacy)
no description available
Submitted by peek
13

URL Validator

Created·2014-09-24 08:41
Flavor·PCRE (Legacy)
Validates - URLs with schemes - http, https and ftp Relative URL starting with / and ../
Submitted by anonymous
16

http url regex

Created·2015-06-21 19:49
Flavor·ECMAScript (JavaScript)
general purpose HTTP URL regex
Submitted by Miguel Castillo @manchagnu
29

Wrap long string to spec length

Created·2013-07-21 20:34
Flavor·PCRE (Legacy)
no description available
Submitted by fullpipe
25

Quote Macthing with escape

Created·2015-05-10 20:48
Flavor·ECMAScript (JavaScript)
Matches text within quotes (", ') and escapes the charecters.
Submitted by Vihan Bhargava
9

Youtube ID match

Created·2013-11-28 13:30
Flavor·PCRE (Legacy)
This regex will match any Youtube video ID thrown at it and return one capturing group containing the ID.
Submitted by Jacob Overgaard
3

Match quoted strings, ignoring escaped quotes

Created·2013-06-26 14:28
Flavor·PCRE (Legacy)
Matches single or double quoted strings, and ignores backslash-escaped quotes within the string.
Submitted by Maddingue
22

UK Postcode Checker

Created·2014-10-21 08:23
Flavor·PCRE (Legacy)
Checks for valid UK/British postcodes. There was another on here that had for some reason been upvoted, but it was actually incorrect as it worked on none of my valid own postcodes! Namely that it assumed two letters and a number (BS3) when you can have variations (M20). Allows for an optional space and separates the two parts into groups.
Submitted by MaffooBristol
13

regex101.com id grabber

Created·2014-08-19 16:10
Flavor·PCRE (Legacy)
grabs the ID for the regex101.com permalink to code
Submitted by chris mccoy
40

Cron schedule

Created·2016-06-02 15:45
Flavor·PCRE (Legacy)
Recommended·
Validate cron lines (even the ones commented out)
Submitted by anonymous
38

best youtube id match ( iframe embed replace ready )

Created·2019-03-12 16:17
Flavor·PCRE (Legacy)
Recommended·
MATCH ANY YOUTUBE ID author : mi-ca v1.0 – 2017.03.08 This Regex match any youtube url and grab the ID. Embed ready √ -- `http://www.youtube.com/watch?v=vpiMAaPTze8 http://youtu.be/l_la5XiQJdk http://youtu.be/NLqAF9hrVbY https://youtu.be/qT47KF5pvfw https://youtu.be/zImHyTyYhM8?t=4s http://www.youtube.com/v/NLqAF9hrVbY?fs=1&hl=en_US http://www.youtube.com/v/NLqAF9hrVbY?fs=1&hl=en_US http://www.youtube.com/watch?v=NLqAF9hrVbY http://www.youtube.com/user/Scobleizer#p/u/1/1p3vcRhsYGo http://www.youtube.com/ytscreeningroom?v=NRHVzbJVx8I http://www.youtube.com/sandalsResorts#p/c/54B8C800269D7C1B/2/PPS-8DMrAn4 http://gdata.youtube.com/feeds/api/videos/NLqAF9hrVbY http://www.youtube.com/watch?v=spDj54kf-vY&feature=g-vrec http://www.youtube.com/watch?v=spDj54kf-vY&feature=youtu.be http://www.youtube-nocookie.com/watch?v=NLqAF9hrVbY http://www.youtube.com/embed/NLqAF9hrVbY https://www.youtube.com/embed/NLqAF9hrVbY https://www.youtube.com/watch?v=MRl7cxSOXdU&feature=youtu.be https://www.youtube.com/watch?v=q07SQFmL4rM https://www.youtube.com/watch?v=q07SQFmL4yM https://www.youtube.com/watch?time_continue=4&v=zImHyTyYhM8 http://www.youtube.com/embed/dQw4w9WgXcQ ... http://www.youtube.com/watch?v=dQw4w9WgXcQ ... http://www.youtube.com/?v=dQw4w9WgXcQ ... http://www.youtube.com/v/dQw4w9WgXcQ ... http://www.youtube.com/e/dQw4w9WgXcQ ... http://www.youtube.com/user/username#p/u/11/dQw4w9WgXcQ ... http://www.youtube.com/sandalsResorts#p/c/54B8C800269D7C1B/0/dQw4w9WgXcQ ... http://www.youtube.com/watch?feature=player_embedded&v=dQw4w9WgXcQ ... http://www.youtube.com/?feature=player_embedded&v=dQw4w9WgXcQ ... https://www.youtube.com/watch?v=DFYRQ_zQ-gk&feature=featured https://www.youtube.com/watch?v=DFYRQ_zQ-gk http://www.youtube.com/watch?v=DFYRQ_zQ-gk //www.youtube.com/watch?v=DFYRQ_zQ-gk www.youtube.com/watch?v=DFYRQ_zQ-gk https://youtube.com/watch?v=DFYRQ_zQ-gk http://youtube.com/watch?v=DFYRQ_zQ-gk //youtube.com/watch?v=DFYRQ_zQ-gk youtube.com/watch?v=DFYRQ_zQ-gk https://m.youtube.com/watch?v=DFYRQ_zQ-gk http://m.youtube.com/watch?v=DFYRQ_zQ-gk //m.youtube.com/watch?v=DFYRQ_zQ-gk m.youtube.com/watch?v=DFYRQ_zQ-gk https://www.youtube.com/v/DFYRQ_zQ-gk?fs=1&hl=en_US http://www.youtube.com/v/DFYRQ_zQ-gk?fs=1&hl=en_US //www.youtube.com/v/DFYRQ_zQ-gk?fs=1&hl=en_US www.youtube.com/v/DFYRQ_zQ-gk?fs=1&hl=en_US youtube.com/v/DFYRQ_zQ-gk?fs=1&hl=en_US https://www.youtube.com/embed/DFYRQ_zQ-gk?autoplay=1 https://www.youtube.com/embed/DFYRQ_zQ-gk http://www.youtube.com/embed/DFYRQ_zQ-gk //www.youtube.com/embed/DFYRQ_zQ-gk www.youtube.com/embed/DFYRQ_zQ-gk https://youtube.com/embed/DFYRQ_zQ-gk http://youtube.com/embed/DFYRQ_zQ-gk //youtube.com/embed/DFYRQ_zQ-gk youtube.com/embed/DFYRQ_zQ-gk https://youtu.be/DFYRQ_zQ-gk?t=120 https://youtu.be/DFYRQ_zQ-gk http://youtu.be/DFYRQ_zQ-gk //youtu.be/DFYRQ_zQ-gk youtu.be/DFYRQ_zQ-gk https://www.youtube.com/watch?v=DFYRQ_zQ-gk&feature=featured https://www.youtube.com/watch?v=DFYRQ_zQ-gk http://www.youtube.com/watch?v=DFYRQ_zQ-gk //www.youtube.com/watch?v=DFYRQ_zQ-gk www.youtube.com/watch?v=DFYRQ_zQ-gk https://youtube.com/watch?v=DFYRQ_zQ-gk http://youtube.com/watch?v=DFYRQ_zQ-gk //youtube.com/watch?v=DFYRQ_zQ-gk youtube.com/watch?v=DFYRQ_zQ-gk https://m.youtube.com/watch?v=DFYRQ_zQ-gk http://m.youtube.com/watch?v=DFYRQ_zQ-gk //m.youtube.com/watch?v=DFYRQ_zQ-gk m.youtube.com/watch?v=DFYRQ_zQ-gk https://www.youtube.com/v/DFYRQ_zQ-gk?fs=1&hl=en_US http://www.youtube.com/v/DFYRQ_zQ-gk?fs=1&hl=en_US //www.youtube.com/v/DFYRQ_zQ-gk?fs=1&hl=en_US www.youtube.com/v/DFYRQ_zQ-gk?fs=1&hl=en_US youtube.com/v/DFYRQ_zQ-gk?fs=1&hl=en_US https://www.youtube.com/embed/DFYRQ_zQ-gk?autoplay=1 https://www.youtube.com/embed/DFYRQ_zQ-gk http://www.youtube.com/embed/DFYRQ_zQ-gk //www.youtube.com/embed/DFYRQ_zQ-gk www.youtube.com/embed/DFYRQ_zQ-gk https://youtube.com/embed/DFYRQ_zQ-gk http://youtube.com/embed/DFYRQ_zQ-gk //youtube.com/embed/DFYRQ_zQ-gk youtube.com/embed/DFYRQ_zQ-gk https://youtu.be/DFYRQ_zQ-gk?t=120 https://youtu.be/DFYRQ_zQ-gk http://youtu.be/DFYRQ_zQ-gk //youtu.be/DFYRQ_zQ-gk youtu.be/DFYRQ_zQ-gk https://www.youtube.com/HamdiKickProduction?v=DFYRQ_zQ-gk `
Submitted by mi-ca.ch
36

Strict Password Validator

Created·2018-01-31 01:03
Updated·2023-07-19 15:28
Flavor·ECMAScript (JavaScript)
This regex matches only when all the following are true: password must contain 1 number (0-9) password must contain 1 uppercase letters password must contain 1 lowercase letters password must contain 1 non-alpha numeric number password is 8-16 characters with no space
Submitted by qho
7

Date validation

Created·2015-07-24 11:21
Flavor·ECMAScript (JavaScript)
Besides leap year handling, this takes care of date validation in the yy-mm-dd format.
Submitted by anonymous
11

Date(Including Leap Year) YYYY-MM-DD hh:mm:ss

Created·2014-03-14 16:49
Flavor·PCRE (Legacy)
Validates DateTime of format YYYY-MM-DD hh:mm:ss including Leap Year
Submitted by Madhan
0

URL matching

Created·2014-07-02 06:34
Flavor·PCRE (Legacy)
Complete url matching with storage of various parameters
Submitted by hjpotter92
34

Parsing browser User Agents

Created·2015-01-23 16:47
Updated·2023-07-19 08:36
Flavor·PCRE (Legacy)
From a (fairly large) list of User Agent strings, extract the OS, Browser, and Device Type.
Submitted by OnlineCop
20

Between tags content

Created·2015-10-24 10:52
Flavor·PCRE (Legacy)
no description available
Submitted by Agustín Bouillet
24

grab valid css rules and properties

Created·2015-06-03 19:17
Flavor·ECMAScript (JavaScript)
no description available
Submitted by Pavel Dominguez
1

Validate alphanumeric and numeric range

Created·2014-09-22 09:13
Flavor·PCRE (Legacy)
For Validating alphanumeric and numeric range
Submitted by anonymous
9

only numbers

Created·2015-11-26 16:19
Flavor·PCRE (Legacy)
A string with only numbers in
Submitted by Gotts
13

PHP variable name

Created·2013-02-05 09:18
Flavor·PCRE (Legacy)
Valid PHP variable name as defined in the manual at http://php.net/manual/en/language.variables.basics.php
Submitted by Erin Millard
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
18

Date Regex(DD/MM/yyyy)

Created·2015-08-26 06:25
Flavor·PCRE (Legacy)
no description available
Submitted by alcaamado
17

Capture comma separated numbers

Created·2015-07-19 01:57
Flavor·PCRE (Legacy)
Capture comma separated numbers, no matter if there are spaces before or after the commas.
Submitted by Fernando Nunes
22

Email (RFC2822)

Created·2015-07-01 09:31
Flavor·ECMAScript (JavaScript)
Recommended·
Email address compliant with RFC2822
Submitted by Jago
12

Full name (Turkish)

Created·2014-09-29 13:31
Flavor·ECMAScript (JavaScript)
Matches case insensitive first name, optional unlimited number of middle names and last name separated with space format. Replaced \w with explicit char range for Turkish support. (Äž accepted as first char not to over complex)
Submitted by CKK
15

IPv4

Created·2015-12-17 08:14
Flavor·PCRE (Legacy)
no description available
Submitted by robwa

Community Library Entry

2

Regular Expression
Created·2026-03-07 18:37
Flavor·Python

r"
^(?P<meta1s>(?:\[[^\]]+\])*)(?P<name>.+(?=\[))(?P<ep>(?:\[(?:(?:NC)?(?:OP|ED|SP(?:\d{2})?)\])|\[(?:\d{2}(?:(?:\.\d+)?(?:_v\d+)?)?)\]))(?P<metas>(?:\[[^\]]+\])*)(?P<others>(?:.*?))(?P<ext>\.(?:mkv|mp4|srt|ass))$
"
gmu
Open regex in editor

Description

matches anime filenames. such as [Group] Name [Episode][Videometa][Audiometa]others.ext supports NCOP, NCED, OP, ED, SP, SPnn, nn, nn.n, nn.n_vn mp4, mkv, srt, ass but you could add more. the episode must be written within a [] bracket. finally, this regex cannot cover all the cases and obviously have some issues, but it's fine under most cases. it is also a small regex practice for me.

Submitted by NullCompute0754