Regular Expressions 101

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Regular ExpressionOpen Workspace

/
^(2[0-4]\d|25[0-5]|1?\d?\d)(?:\.(?1)){3}$
/
gm

Description
Created·2015-06-09 14:53
Type·Match
Flavor·PCRE (Legacy)

Validate IPv4 addresses using PCRE's recursion patterns. A shorter but less efficient alternative to https://regex101.com/r/wZ6oY5/1

Submitted by Captain Haddock
Open Workspace