Regular expression for IP Address Validation

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There is a simpler way. You just need to split the string on . and check that every number is between 0 and 255.

Additionally, you can check for hexa and split on : for IPv6.

Just because I think it’s funny:

^(\d|[1-9]\d|1\d\d|2([0-4]\d|5[0-5]))\.(\d|[1-9]\d|1\d\d|2([0-4]\d|5[0-5]))\.(\d|[1-9]\d|1\d\d|2([0-4]\d|5[0-5]))\.(\d|[1-9]\d|1\d\d|2([0-4]\d|5[0-5]))$

Here is a regex that should handle IPs (v4).

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