Regular Expressions 101

Sponso⁠rs

Community Library

485

regex101.com permalink id grabber

Created·2013-12-12 13:09
Updated·2024-04-11 14:32
Type·Match
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
107

ECMAScript/JavaScript trim

Created·2013-09-10 08:21
Updated·2024-09-19 14:38
Type·Match
Flavor·JavaScript
Trim leading and trailing whitespace from a string.
Submitted by fp
238

Matching email addresses per RFC5322

Created·2013-10-23 17:46
Type·Match
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
73

Regex for telephone numbers all over the world

Created·2014-04-08 07:58
Updated·2023-10-09 14:47
Type·Match
Flavor·JavaScript
Recommended·
Detects most of the phone numbers all over the world
Submitted by Aditya Joshi
19

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

Created·2013-05-17 13:07
Type·Match
Flavor·PCRE (Legacy)
Recommended·
Validate and capture dateTime parts, includes validation for leap years, range 1000-2999. Fixed bug
Submitted by Ka.
41

URL regexp

Created·2013-01-14 17:52
Type·Match
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
87

Password Validation

Created·2015-07-08 18:46
Type·Match
Flavor·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
Type·Match
Flavor·PCRE (Legacy)
no description available
Submitted by Mitus M.
6

Password

Created·2013-12-06 14:02
Updated·2023-07-21 04:59
Type·Match
Flavor·JavaScript
no description available
Submitted by Anonymous
53

Disorted Email Addresses

Created·2013-01-16 14:11
Type·Substitution
Flavor·PCRE (Legacy)
Matches distorted email addresses and converts them back to real ones.
Submitted by dislick
31

Email address (most used)

Created·2015-07-01 09:32
Type·Match
Flavor·JavaScript
Email address, most used cases
Submitted by Jago
18

Email validation

Created·2014-09-16 13:45
Type·Match
Flavor·PCRE (Legacy)
no description available
Submitted by tutsplus.com
83

Distinguish torrent files (series vs movies)

Created·2014-06-26 09:59
Updated·2023-07-20 15:08
Type·Match
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
4

Phone number

Created·2015-06-23 19:15
Type·Match
Flavor·PCRE (Legacy)
no description available
Submitted by Mark Landry
36

Google like regex

Created·2014-05-12 13:35
Type·Match
Flavor·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
16

Alphanumeric Regex

Created·2015-06-15 13:57
Type·Match
Flavor·PCRE (Legacy)
no description available
Submitted by Deepan
14

Phone Number

Created·2015-08-11 17:07
Type·Match
Flavor·JavaScript
Allows phone numbers with optional country code, optional special characters and whitespace
Submitted by Tlmader
16

Password

Created·2015-04-28 16:49
Type·Match
Flavor·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
Type·Match
Flavor·PCRE (Legacy)
1-15 alphanumeric login name
Submitted by gsanchezc
26

match valid JSON

Created·2014-11-17 20:47
Type·Match
Flavor·PCRE (Legacy)
Matches any valid JSON object, matches recursively. Passes all JSON test cases I found.
Submitted by Mateon1
13

URL Validator

Created·2014-09-24 08:41
Type·Match
Flavor·PCRE (Legacy)
Validates - URLs with schemes - http, https and ftp Relative URL starting with / and ../
Submitted by Anonymous
3

Match quoted strings, ignoring escaped quotes

Created·2013-06-26 14:28
Type·Match
Flavor·PCRE (Legacy)
Matches single or double quoted strings, and ignores backslash-escaped quotes within the string.
Submitted by Maddingue
16

http url regex

Created·2015-06-21 19:49
Type·Match
Flavor·JavaScript
general purpose HTTP URL regex
Submitted by Miguel Castillo @manchagnu
9

Youtube ID match

Created·2013-11-28 13:30
Type·Match
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
29

CSV line parsing

Created·2014-10-15 13:22
Type·Match
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
31

ninite

Created·2015-09-29 11:28
Type·Match
Flavor·PCRE (Legacy)
no description available
Submitted by peek
25

Quote Macthing with escape

Created·2015-05-10 20:48
Type·Match
Flavor·JavaScript
Matches text within quotes (", ') and escapes the charecters.
Submitted by Vihan Bhargava
0

URL matching

Created·2014-07-02 06:34
Type·Match
Flavor·PCRE (Legacy)
Complete url matching with storage of various parameters
Submitted by hjpotter92
29

Wrap long string to spec length

Created·2013-07-21 20:34
Type·Substitution
Flavor·PCRE (Legacy)
no description available
Submitted by fullpipe
13

regex101.com id grabber

Created·2014-08-19 16:10
Type·Match
Flavor·PCRE (Legacy)
grabs the ID for the regex101.com permalink to code
Submitted by chris mccoy
7

Date validation

Created·2015-07-24 11:21
Type·Match
Flavor·JavaScript
Besides leap year handling, this takes care of date validation in the yy-mm-dd format.
Submitted by Anonymous
22

UK Postcode Checker

Created·2014-10-21 08:23
Type·Match
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
1

Validate alphanumeric and numeric range

Created·2014-09-22 09:13
Type·Match
Flavor·PCRE (Legacy)
For Validating alphanumeric and numeric range
Submitted by Anonymous
11

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

Created·2014-03-14 16:49
Type·Match
Flavor·PCRE (Legacy)
Validates DateTime of format YYYY-MM-DD hh:mm:ss including Leap Year
Submitted by Madhan
3

phone

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

only numbers

Created·2015-11-26 16:19
Type·Match
Flavor·PCRE (Legacy)
A string with only numbers in
Submitted by Gotts
-18

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

Created·2013-05-13 22:48
Updated·2023-07-24 16:28
Type·Match
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.
0

utf-8 language

Created·2015-09-15 13:13
Type·Match
Flavor·PCRE (Legacy)
this regex is support for all languages
Submitted by Jigar Dhaduk
9

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

Created·2014-05-22 23:34
Type·Match
Flavor·Python
This is simplified from my last submission.
Submitted by Dale O'Brien
4

url

Created·2015-07-23 21:43
Type·Unit Tests
Flavor·JavaScript
no description available
Submitted by Anonymous
6

Matching balanced parens, brackets, and braces

Created·2013-09-29 18:23
Type·Match
Flavor·PCRE (Legacy)
no description available
Submitted by Noah Luck Easterly
13

PHP variable name

Created·2013-02-05 09:18
Type·Match
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
6

Simple Number

Created·2015-10-20 16:06
Type·Match
Flavor·JavaScript
Verifies Number is a negative/positive number. Number may be a decimal, but if it is, it requires at least one number before and after the decimal place. Decimal numbers may also be negative or positive. Only 1 decimal place is allowed.
Submitted by David P Smith
1

IP Addresses

Created·2015-07-16 16:42
Type·Match
Flavor·PCRE (Legacy)
Matches IP Addresses with minimum false positives
Submitted by Austin-Hanson
0

Name

Created·2015-06-04 14:55
Type·Match
Flavor·JavaScript
Simple name matching Matches english names only, you may add international characters to list of characters.
Submitted by Ehsan
12

Full name (Turkish)

Created·2014-09-29 13:31
Type·Match
Flavor·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
6

json

Created·2014-08-14 17:30
Type·Match
Flavor·PCRE (Legacy)
{1:aa,2:bb,3:"aa:bb"}
Submitted by suat & umut
20

Between tags content

Created·2015-10-24 10:52
Type·Match
Flavor·PCRE (Legacy)
no description available
Submitted by Agustín Bouillet
4

Element's Attribute Value in XML (simple)

Created·2014-06-24 11:29
Type·Substitution
Flavor·PCRE (Legacy)
Simple regular expression for extracting attribute value of the element in XML-string. Attribute value should be in quotes.
Submitted by Nikita Danilov
7

Match text (not within html tag)

Created·2015-05-12 12:38
Type·Substitution
Flavor·JavaScript
no description available
Submitted by Moistly

Community Library Entry

1

Regular ExpressionOpen Workspace

/
^(?:https?:\/\/)((?:www\.)|(?:m\.))?soundcloud\.com\/[a-z0-9](?!.*?(-|_){2})[\w-]{1,23}[a-z0-9](?:\/.+)?$
/
gm

Description
Created·2021-08-03 06:06
Updated·2021-10-05 06:44
Type·Match
Flavor·PCRE2 (PHP)

SoundCloud doesn't have usernames in their URLs, but the user can customize their url with the following rules for what comes after soundcloud.com/:

• Use only numbers, lowercase letters, underscores, or hyphens. • Profile URLs must not start or end with an underscore or hyphen. • Profile URLs must not have two consecutive underscores or hyphens. • Profile URLs must be between 3 and 25 characters.

Submitted by Dylan
Open Workspace