Regular Expressions 101

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Library entries

6
pcre

IPv4 Validator

no description available
Submitted by anonymous - 2 years ago
5
pcre

Repair unquoted HTML attribute values

Usually MSWord HTML exports
Submitted by Ka. - 9 years ago
5
pcre

All href in a tag

Find all href in a tag
Submitted by Miron Yanovskiy - 9 years ago
5
pcre

Find All Python imports

no description available
Submitted by anonymous - 8 years ago
5
pcre

relative to absolute

relative to absolute
Submitted by xp_prg - 8 years ago
5
pcre

URL

URL Description from Dr. M. G. @ Brookes
Submitted by anonymous - 8 years ago
5
pcre

Latitude,Longitude fetcher

Useful to work with GoogleMap API.
Submitted by anonymous - 7 years ago
5
pcre

ipv6

Match an ipv6 address
Submitted by Frusty - 7 years ago
5
pcre

get specific value from html tag

no description available
Submitted by A.ROA - 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