Regular Expressions 101

Community Patterns

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1

Regular Expression
Created·2015-06-09 14:46
Flavor·PCRE (Legacy)

/
^(2[0-4]\d|25[0-5]|1\d\d|\d\d?)\.(?1)\.(?1)\.(?1)$
/
gm
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Description

Validate IPv4 addresses using PCRE's recursion patterns.

Submitted by Captain Haddock