Regular Expressions 101

Library entries

-3
pcre

DateTime YYYY-MM-DD hh:mm:ss

no description available
Submitted by Madhan - 9 years ago
-3
pcre

Date and Time

no description available
Submitted by anonymous - 9 years ago
-3
pcre

hjghj

no description available
Submitted by anonymous - 9 years ago
-3
pcre

cake

no description available
Submitted by anonymous - 9 years ago
-3
pcre

mail

no description available
Submitted by anonymous - 9 years ago
-3
javascript

s

s
Submitted by anonymous - 9 years ago
-3
javascript

1111

no description available
Submitted by anonymous - 9 years ago
-3
javascript

111

no description available
Submitted by anonymous - 9 years ago
-3
javascript

111

no description available
Submitted by anonymous - 9 years ago
-3
pcre

british postcode check

no description available
Submitted by anonymous - 9 years ago
-3
pcre

British Postcode Check

no description available
Submitted by guest - 9 years ago
-3
pcre

regex help

help please. i need regex,
Submitted by James - 9 years ago
-3
pcre

mama

no description available
Submitted by anonymous - 9 years ago
-3
javascript

Detect a numeric string

no description available
Submitted by Ankur Chauhan - 8 years ago
-3
pcre

Select a HTML table and all its innerHTML

no description available
Submitted by @ixzy24 - 8 years ago
-3
pcre

asdfasfdasdfasdffasdf

asdfasdfadfasddfasdfadsaf
Submitted by afdsadsfasdfadsf - 8 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 - 9 years ago