Regular Expressions 101

Order By

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

Community Patterns

-2

cron expression

ECMAScript (JavaScript)
This is a relaxed cron validation, meaning that any valid cron expression should pass this; but not anything that passes regex validation is a good cron expression. Used as preliminary validation in web ui. Supports all special characters. Includes seconds field.
Submitted by enlait - 9 years ago
-2

UK (Europe) DateTime

ECMAScript (JavaScript)
Validates input to match UK Date Time standard
Submitted by Bascoder - 9 years ago
-2

Validate credit card numbers

PCRE (PHP <7.3)
Visa, MasterCard, American Express, Diners Club, Discover, JCB
Submitted by www.regular-expressions.info/creditcard.html - 9 years ago
-2

IPv4

Python
allows for all legal IPv4 addresses
Submitted by anonymous - 9 years ago
-2

Twitter Date format

ECMAScript (JavaScript)
no description available
Submitted by hjgabrielsen - 9 years ago
-2

Expression that does not include a subexpression

PCRE (PHP <7.3)
Pattern that matches all expression that not include a subexpression. The subexpression could be replaced by a string.
Submitted by aquintas - 9 years ago
-2

Parse all adresses in href

PCRE (PHP <7.3)
no description available
Submitted by anonymous - 9 years ago
-2

Match words in a string

ECMAScript (JavaScript)
no description available
Submitted by anonymous - 9 years ago
-2

username in url

PCRE (PHP <7.3)
should start with letter follow by letters and numbers and (-) - zero or more can't start or finish with (-) can't have two or more consecutive (-) char
Submitted by Ali Azmoude - 9 years ago
-2

twitter ids

ECMAScript (JavaScript)
no description available
Submitted by jaybill - 9 years ago
-2

Select the numeric part of a price following an ascii dollar sign

PCRE (PHP <7.3)
no description available
Submitted by anonymous - 9 years ago
-2

JSON KEY VALUE

PCRE (PHP <7.3)
Get key value in json string
Submitted by Marcio Paiva Barbosa - 9 years ago
-2

Date format regex for ddMMMyyyy

ECMAScript (JavaScript)
no description available
Submitted by anonymous - 9 years ago
-2

twitter usernames

Python
no description available
Submitted by anonymous - 9 years ago
-2

finds the instance of two or more repeating letters

Python
no description available
Submitted by cp0153 - 9 years ago
-2

checklists item

Python
checklists item
Submitted by Tobias Hochgürtel - 9 years ago
-2

filter

Python
no description available
Submitted by anonymous - 9 years ago
-2

Word ending with colon

ECMAScript (JavaScript)
no description available
Submitted by hj - 9 years ago
-2

Mathematical Expressions

PCRE (PHP <7.3)
ValidatesMathematical Expressions. Ignores whitespace. Includes parenthesis matching.
Submitted by Jeremy Friesen - 9 years ago
-2

HTML <script> regex

PCRE (PHP <7.3)
no description available
Submitted by anonymous - 9 years ago
1...56789...901

Community Library Entry

-2

Regular Expression
ECMAScript (JavaScript)

/
^((((31[- /.](0?[13578]|1[02]))|((29|30)[- /.](0?[1,3-9]|1[0-2])))[- /.](1[6-9]|[2-9]\d)?\d{2})|(29\/0?2[- /.](((1[6-9]|[2-9]\d)?(0[48]|[2468][048]|[13579][26])|((16|[2468][048]|[3579][26])00))))|(0?[1-9]|1\d|2[0-8])[- /.]((0?[1-9])|(1[0-2]))[- /.]((1[6-9]|[2-9]\d)?\d{2})) (20|21|22|23|[0-1]?\d):[0-5]?\d:?[0-5]?\d$
/
Open regex in editor

Description

Validates input to match UK Date Time standard

Submitted by Bascoder - 9 years ago