Regular Expressions 101

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Community Patterns

2

MIME type verification

PCRE (PHP <7.3)
See http://tools.ietf.org/html/rfc2045#section-5.1
Submitted by Erin Millard - 12 years ago
1

PHP ReflectionParameter:__toString() parser

PCRE (PHP <7.3)
See http://www.php.net/manual/en/reflectionparameter.tostring.php
Submitted by Erin Millard - 12 years ago
13

PHP variable name

PCRE (PHP <7.3)
Valid PHP variable name as defined in the manual at http://php.net/manual/en/language.variables.basics.php
Submitted by Erin Millard - 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
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
1...900901902

Community Library Entry

-1

Regular Expression
PCRE (PHP <7.3)

/
((?'ip4'(\d{1,3}\.){3}\d{1,3})|(?'ip6'(([0-9a-f]{1,4})?:){7}([0-9a-f]{4})?))
/
gm
Open regex in editor

Description

regex to capture ip4/ip6 addresses with named capture groups. The Following features are included:

  • PHP and python support
  • ip4 byte size check (ensures byte can't exceed 255)
  • ip6 checks if hex characters are valid
  • uses a negative lookbehind to check if the ip is a word on its own
  • named capture groups to facilitate extraction of either ip4 or ip6
Submitted by Meryo - 4 years ago