Regular Expressions 101

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Library entries

6
javascript

Email with + symbol

email that accepts the plus (+) symbol
Submitted by luckcheese - 7 years ago
6
javascript

HTML img

Grabs all HTML tags
Submitted by Pirate11 - 7 years ago
6
javascript

Email

no description available
Submitted by anonymous - 6 years ago
7
pcre

rsyslog test

global modifier
Submitted by dtmland - 7 years ago
7
javascript

Match text (not within html tag)

no description available
Submitted by Moistly - 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