Regular Expressions 101

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Community Patterns

107

ECMAScript/JavaScript trim

ECMAScript (JavaScript)
Trim leading and trailing whitespace from a string.
Submitted by fp - 11 years ago (Last modified 3 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 8 months ago)
1...900901902

Community Library Entry

1

Regular Expression
PCRE2 (PHP >=7.3)

/
(?:\d{1,3}\.){3}\d{1,3}\b|\b(?:[A-Fa-f0-9]{1,4}:){7}[A-Fa-f0-9]{1,4}\b|\b(?:[A-Fa-f0-9]{1,4}:){0,6}(?:[A-Fa-f0-9]{1,4})?::(?:[A-Fa-f0-9]{1,4}:){0,5}(?:[A-Fa-f0-9]{1,4})?
/
gm
Open regex in editor

Description

Regex pattern detection for IPv4 addresses and IPv6 addresses in zero compression format.

Submitted by Lewis Wigmore - a year ago (Last modified a year ago)