Regular Expressions 101

Order By

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

Community Patterns

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 6 months ago)
236

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
106

ECMAScript/JavaScript trim

ECMAScript (JavaScript)
Trim leading and trailing whitespace from a string.
Submitted by fp - 11 years ago (Last modified 17 days 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 - 10 years ago (Last modified a year 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
18

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

Recommended
PCRE (PHP <7.3)
Validate and capture dateTime parts, includes validation for leap years, range 1000-2999. Fixed bug
Submitted by Ka. - 11 years 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
35

http://

PCRE (PHP <7.3)
no description available
Submitted by Mitus M. - 11 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
82

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)
6

Password

ECMAScript (JavaScript)
no description available
Submitted by anonymous - 11 years ago (Last modified a year ago)
31

Email address (most used)

ECMAScript (JavaScript)
Email address, most used cases
Submitted by Jago - 9 years ago
34

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 - 10 years ago
18

Email validation

PCRE (PHP <7.3)
no description available
Submitted by tutsplus.com - 10 years ago
16

Alphanumeric Regex

PCRE (PHP <7.3)
no description available
Submitted by Deepan - 9 years ago
4

Phone number

PCRE (PHP <7.3)
no description available
Submitted by Mark Landry - 9 years ago
14

Phone Number

ECMAScript (JavaScript)
Allows phone numbers with optional country code, optional special characters and whitespace
Submitted by Tlmader - 9 years ago
26

match valid JSON

PCRE (PHP <7.3)
Matches any valid JSON object, matches recursively. Passes all JSON test cases I found.
Submitted by Mateon1 - 10 years ago
16

Password

ECMAScript (JavaScript)
Safe Password that allow only with a number, a lowercase, a uppercase, and a special character
Submitted by davidlondono - 9 years ago
23

userName

PCRE (PHP <7.3)
1-15 alphanumeric login name
Submitted by gsanchezc - 9 years ago
123...897

Community Library Entry

1

Regular Expression
PCRE2 (PHP >=7.3)

/
^(?:[0][x][0-9A-F]{2}[,]\s){7}[0][x][0-9A-F]{2}$
/
g
Open regex in editor

Description

Match a verbose, comma delimited, 64-bit hexadecimal, as sent by an ESP32, via the DallasTemperature getAddress method, for a DS18B20 temperature sensor. Used in Google Sheets, or Excel, Data Validation, after copying and pasting the input string from the Serial Monitor. The ESP32 interrogates the sensor, after soldering, to verify it works, prior to installation.

Submitted by CharlesMartel732 - 6 months ago