Regular Expressions 101

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Library entries

-1
pcre

REMOVE leading and trailing WHITESPACE

no description available
Submitted by ka - 10 years ago
-1
pcre

Twitter Hashtags

no description available
Submitted by anonymous - 9 years ago
-1
pcre

regex on paintkits

no description available
Submitted by anonymous - 9 years ago
-1
pcre

Match the ID on individual Vimeo URLs

no description available
Submitted by Josh K - 9 years ago
-1
pcre

Finds <font> tag

Useful for cleaning old html code from tags
Submitted by anonymous - 9 years ago
-1
pcre

Substitutin

no description available
Submitted by anonymous - 9 years ago
-1
pcre

RegExp black list example usage

no description available
Submitted by Vadim Markovtsev - 8 years ago
-1
pcre

posix

no description available
Submitted by anonymous - 7 years ago
-1
pcre

website

If needed to test entered website
Submitted by Max Shishkov - 7 years ago
-1
pcre

Extract Java Exception Message Field

no description available
Submitted by anonymous - 7 years ago
-1
pcre

index

include index.aspx
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