Regular Expressions 101

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Library entries

104
javascript

trim

trim string
Submitted by fp - 9 years ago
35
javascript

IP Address validator

Validates IPv4 IP Address
Submitted by krzysp - 8 years ago
31
javascript

Email address (most used)

Email address, most used cases
Submitted by Jago - 8 years ago
16
javascript

http url regex

general purpose HTTP URL regex
Submitted by Miguel Castillo @manchagnu - 8 years ago
15
javascript

Hashtag

The secret of the Twitterverse.
Submitted by Joogl - 8 years ago
15
javascript

Email (RFC2822)

Email address compliant with RFC2822
Submitted by Jago - 8 years ago
13
javascript

us postal/zip

no description available
Submitted by jay johnson - 9 years ago
12
javascript

Username with "_" "-"

no description available
Submitted by Gianvy - 7 years ago
12
javascript

US Currency Format

no description available
Submitted by anonymous - 7 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