Regular Expressions 101

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Community Patterns

30

Cron schedule

Recommended
PCRE (PHP <7.3)
Validate cron lines (even the ones commented out)
Submitted by anonymous - 8 years ago
31

Email address (most used)

ECMAScript (JavaScript)
Email address, most used cases
Submitted by Jago - 9 years ago
31

ninite

PCRE (PHP <7.3)
no description available
Submitted by peek - 9 years ago
32

Strict Password Validator

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...
Submitted by qho - 7 years ago (Last modified a year ago)
35

http://

PCRE (PHP <7.3)
no description available
Submitted by Mitus M. - 11 years ago
35

Google like regex

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 - 11 years ago
35

IP Address validator

ECMAScript (JavaScript)
Validates IPv4 IP Address
Submitted by krzysp - 9 years ago
40

URL regexp

PCRE (PHP <7.3)
A quite neat regular expression for URLs, e-mails..., I found on Matthew O'Riordan's blog.
Submitted by Matthew O'Riordan - 12 years ago
52

Disorted Email Addresses

PCRE (PHP <7.3)
Matches distorted email addresses and converts them back to real ones.
Submitted by dislick - 12 years ago
73

Regex for telephone numbers all over the world

Recommended
ECMAScript (JavaScript)
Detects most of the phone numbers all over the world
Submitted by Aditya Joshi - 11 years ago (Last modified a year ago)
83

Distinguish torrent files (series vs movies)

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 prev...
Submitted by Firas Dib - 10 years ago (Last modified a year ago)
87

Password Validation

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 - 9 years ago
107

ECMAScript/JavaScript trim

ECMAScript (JavaScript)
Trim leading and trailing whitespace from a string.
Submitted by fp - 11 years ago (Last modified 2 months ago)
238

Matching email addresses per RFC5322

PCRE (PHP <7.3)
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 - 11 years ago
483

regex101.com permalink id grabber

PCRE (PHP <7.3)
Grabs the ID for the regex101.com permalink code. If a revision number is provided, grab that as well.
Submitted by chris mccoy - 11 years ago (Last modified 7 months ago)
1...898899900

Community Library Entry

30

Regular Expression
Recommended
PCRE (PHP <7.3)

~
^\s*\#?\s*(?:(?:(?'mins'[0-5]?\d)(?:[-,](?&mins))*)|\*)(?:/\d{1,2})?\s+(?:(?:(?'hours'(?:2[0-3]|[01]?\d))(?:[-,](?&hours))*)|\*)(?:/\d{1,2})?\s+(?:(?:(?'dmon'(?:3[01]|[12]?\d))(?:[-,](?&dmon))*)|\*)(?:/\d{1,2})?\s+(?:(?:(?'mon'(?:1[0-2]|[1-9]))(?:[-,](?&mon))*)|\*)(?:/\d{1,2})?\s+(?:(?:(?'dow'(?:[0-6]|\b(?:mon|tue|wed|thu|fri|sat|sun)\b))(?:[-,](?&dow))*)|\*)(?:/\d{1,2})?\s+.+$
~
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Description

Validate cron lines (even the ones commented out)

Submitted by anonymous - 8 years ago