Regular Expressions 101

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Library entries

12
pcre

Match Gmail Email

Match Gmail Email
Submitted by Óscar Enríquez - 8 years ago
11
pcre

Codice fiscale

Check "codice fiscale"
Submitted by Luca - 7 years ago
10
pcre

remove comments from php code

no description available
Submitted by anonymous - 8 years ago
9
pcre

Validate Base64 single-line string

no description available
Submitted by ka. - 9 years ago
9
pcre

Fixo LDN CSP e SEM CSP

no description available
Submitted by Marcos Müller - 8 years ago
9
pcre

only numbers

A string with only numbers in
Submitted by Gotts - 7 years ago

match valid JSON

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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

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Submitted by Mateon1 - 8 years ago