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ggrandes/regex-ipv4.md

Created March 27, 2022 20:29
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Regular Expression - IPv4 (Perl / Java)
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regex-ipv4.md
Match: 0.0.0.0-255.255.255.255

Perl / PCRE

$input =~ /^(?:(25[0-5]|2[0-4]\d|1\d\d|[1-9]\d|\d)\.){3}(?1)$/;
grep -P '^(?:(25[0-5]|2[0-4]\d|1\d\d|[1-9]\d|\d)\.){3}(?1)$' <<<"$input"

Java

Pattern.compile("^(?:(?:25[0-5]|2[0-4]\\d|1\\d\\d|[1-9]\\d|\\d)\\.){3}(?:25[0-5]|2[0-4]\\d|1\\d\\d|[1-9]\\d|\\d)$")
       .matcher(input).matches();

References:

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