Regular Expressions 101

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Library entries

8
pcre

Date time Advanced

no description available
Submitted by Mr.Neutro - 9 years ago
8
pcre

Alphanumeric and Spaces

Alow alphanumeric characters and spaces
Submitted by JTN - 7 years ago
8
pcre

If-Then-Else Conditionals

no description available
Submitted by anonymous - 7 years ago
8
python

domain - host

no description available
Submitted by anonymous - 7 years ago
8
pcre

Fiddler raw body to PHP array

no description available
Submitted by garsax - 6 years ago
8
pcre

Max - URL Extract

no description available
Submitted by Ayush - 6 years ago
7
python

CSS Import

no description available
Submitted by anonymous - 8 years ago
7
pcre

rsyslog test

global modifier
Submitted by dtmland - 7 years ago
7
python

repeat group match

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

Any positive integer except zero

no description available
Submitted by Harsh - 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