Regular Expression Tools

IP RegEx

Simple IP RegEx

/\b\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\b

Let's break down this regular expression into smaller parts.

\d{1,3} matches decimal number at least 1 time but no more then 3 times. It is repeated 4 times to match each individual part of the IP address.

Router database example

In this example IP address is matched in Apache .htaccess file.

Router Database

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