Regular Expressions 101

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Community Patterns

3

Validate Base64 with new lines (e.g. GPG base64 messages)

PCRE (PHP <7.3)
This regular expression validates if given string is formatted in Base64, additional it accepts new lines, since payload can have new lines in it.
Submitted by wpodgorski - 9 years ago
3

Select all number greater than 36

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

YouTube Iframe parser

PCRE (PHP <7.3)
no description available
Submitted by anonymous - 9 years ago
3

Extract All Steam Keys

PCRE (PHP <7.3)
Extract all Steam Keys from a Given String
Submitted by Ashesh Kumar - 9 years ago
-2

Between two strings

Python
Awesome explanation of nested lookbacks
Submitted by OnlineCop - 9 years ago
4

Validate hex color

PCRE (PHP <7.3)
Validates hexadecimal color codes based on the following rule set: Optionally starting with a hash. 3 or 6 characters in length. Using the [0-9a-f] character set.
Submitted by Nathaniel Blackburn - 9 years ago
3

Firt letter of names capitalize with exceptions

ECMAScript (JavaScript)
Check if brazilian names are imputed correctly. Ex: Paulo da Silva
Submitted by William - 9 years ago
4

Jeff Test

PCRE (PHP <7.3)
Valid and Invalid emails
Submitted by anonymous - 9 years ago
4

JWT Validation

PCRE (PHP <7.3)
Validate a Json Web Token (JWT).
Submitted by Erik Maas - 9 years ago
4

kenteken validator

PCRE (PHP <7.3)
validator voor kenteken vb: 11-AA-BB
Submitted by Senne Root - 9 years ago
4

find uncommented coffeescript console.logs

ECMAScript (JavaScript)
no description available
Submitted by valiafetisov - 9 years ago
3

apache access log

PCRE (PHP <7.3)
parse the apache access log
Submitted by pagu - 9 years ago
2

password 1upper 1lower 1number 1specialcharater

ECMAScript (JavaScript)
fjk@1Qaa$
Submitted by Anuswadh - 9 years ago
4

Version Matcher

PCRE (PHP <7.3)
Matches version strings.
Submitted by anmols - 9 years ago
2

END on new line

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

extract domain with port

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

Removes script tags

ECMAScript (JavaScript)
no description available
Submitted by ghs - 9 years ago
3

Match a valid IPv4 or IPv6 address

PCRE (PHP <7.3)
This regular expression will match an IPv4 address as well as both compressed or uncompressed IPv6 address.
Submitted by Tom Groeneveld, SevOne.com - 9 years ago
4

Function Declaration / Expression

ECMAScript (JavaScript)
matches both function declarations and expressions in javascript. ex. function name () {...} || function () {}
Submitted by Ja Superior - 9 years ago
4

DNS hostname well-formedness validation

PCRE (PHP <7.3)
Validates that a DNS hostname is well-formed only. You will still need to check that the overall length of the hostname, including the implied trailing "." (if not present), does not exceed 255 bytes.
Submitted by Jeff Walter - 9 years ago
1...2021222324...901

Community Library Entry

4

Regular Expression
PCRE (PHP <7.3)

/
^#?([0-9a-f]{6}|[0-9a-f]{3})$
/
i
Open regex in editor

Description

Validates hexadecimal color codes based on the following rule set:

  • Optionally starting with a hash.
  • 3 or 6 characters in length.
  • Using the [0-9a-f] character set.
Submitted by Nathaniel Blackburn - 9 years ago