Regex for IP Addresses: Match IPv4 and IPv6 With Accurate Patterns
Match IPv4 and IPv6 addresses with accurate regex. Avoid the common overmatch trap and validate octets are within 0–255 range correctly.
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Tags: developer-tools, regex, networking
Regex for IP Addresses: Match IPv4 and IPv6 With Accurate Patterns IP address validation sounds simple until you try it. A naive regex like matches , which is not a valid IPv4 address. A correct regex needs to constrain each octet to 0–255. IPv6 adds a new layer of complexity with its 8-group hex format and multiple shorthand notations. This article gives you accurate, tested patterns for both. IPv4 With CIDR Notation CIDR notation appends a prefix length: . The prefix length is to . The CIDR suffix: — 0 through 9 — 10 through 29 — 30, 31, 32 Matches: , , , , --- IPv4 Extraction From Text To find IPv4 addresses embedded in log files or documents: The word boundaries prevent partial matches inside URLs or longer strings. --- IPv6: Understanding the Format IPv6 addresses are 128 bits…
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