Regular Expressions 101

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Library entries

-3
pcre

ipv4 - short version

no description available
Submitted by gromozeka - 7 years ago
-3
pcre

UpperCase words

no description available
Submitted by ivo - 7 years ago
-3
pcre

a

a
Submitted by a - 7 years ago
-3
pcre

Replace abba with ABBA

no description available
Submitted by anonymous - 7 years ago
-3
pcre

retrieve hostname without subdomain

no description available
Submitted by Diego Zuluaga - 7 years ago
-4
pcre

Twitter hashtags extractor

Extract hashtags from text
Submitted by anonymous - 8 years ago
-4
pcre

For telephone

This is for telephone pattern +1 123-123-1234
Submitted by kevin - 7 years ago
-4
pcre

IP Address Validation

List of possible IPs
Submitted by Paolo Carrasco - 7 years ago
-7
pcre

hi

no description available
Submitted by asf - 8 years ago
-8
pcre

Regular exp to exclude a domain

to exclude one domain abc.com
Submitted by Sandy - 10 years ago
-9
pcre

test

no description available
Submitted by test - 9 years ago
-10
pcre

need help

no description available
Submitted by sachin - 9 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

Description

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Submitted by Mateon1 - 8 years ago