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IPv4 Questions and Answers - O'Reilly Answers
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How to Match IPv4 Addresses with Regular Expressions
By Jan Goyvaerts: 30 September 2009 - 01:11 PM
If you want to check whether a certain string represents a valid IPv4 address in 255.255.255.255 notation, try one of these examples from Regular Expressions Cookbook: Simple regex to check fo...
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