Regular Expressions 101

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Library entries

4
javascript

Mobile phone russia

Submitted by Johhny - 7 years ago
4
pcre

Jeff Test

Valid and Invalid emails
Submitted by anonymous - 7 years ago
4
javascript

vowel words

([!-\~]aeiou)
Submitted by Ipsita Mohanty - 7 years ago
4
pcre

kenteken validator

validator voor kenteken vb: 11-AA-BB
Submitted by Senne Root - 7 years ago
4
pcre

Mask credit card

no description available
Submitted by Albert Paris - 7 years ago
4
pcre

Version Matcher

Matches version strings.
Submitted by anmols - 7 years ago
4
javascript

extract domain with port

no description available
Submitted by yooresh - 6 years ago
4
pcre

c#

no description available
Submitted by anonymous - 6 years ago
4
javascript

UK Postcode

no description available
Submitted by msyed - 6 years ago
4
pcre

html tags

no description available
Submitted by anonymous - 6 years ago
4
pcre

Get image tag attributes

no description available
Submitted by Agustín Bouillet - 6 years ago

match valid JSON

Vote

26

Regular Expression
pcre

/
(?(DEFINE) # Note that everything is atomic, JSON does not need backtracking if it's valid # and this prevents catastrophic backtracking (?<json>(?>\s*(?&object)\s*|\s*(?&array)\s*)) (?<object>(?>\{\s*(?>(?&pair)(?>\s*,\s*(?&pair))*)?\s*\})) (?<pair>(?>(?&STRING)\s*:\s*(?&value))) (?<array>(?>\[\s*(?>(?&value)(?>\s*,\s*(?&value))*)?\s*\])) (?<value>(?>true|false|null|(?&STRING)|(?&NUMBER)|(?&object)|(?&array))) (?<STRING>(?>"(?>\\(?>["\\\/bfnrt]|u[a-fA-F0-9]{4})|[^"\\\0-\x1F\x7F]+)*")) (?<NUMBER>(?>-?(?>0|[1-9][0-9]*)(?>\.[0-9]+)?(?>[eE][+-]?[0-9]+)?)) ) \A(?&json)\z
/
x

Description

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Submitted by Mateon1 - 8 years ago