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Remove leading zeros from IP address with C #

I have the IP address "127.000.000.001", how can I remove the leading zeros to get this "127.0.0.1"? At the moment I am using a regex like this

Regex.Replace("127.000.000.001", "0*([0-9]+)", "${1}")

Is there any other way to achieve this result without using a regular expression?

I am using Visual C # 3.0 for this code

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3 answers


Yes, there's a much better way out there than using regular expressions to do this.

Try the System.Net.IpAddress

class instead .



There is a method ToString()

that returns the standard notation of the public version of the IP address. This is probably what you want here.

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The IP address object will treat the leading zero as octal, so it should not be used to remove leading zeros as it will not handle 192.168.090.009.



http://social.msdn.microsoft.com/Forums/en-US/netfxbcl/thread/21510004-b719-410e-bbc5-a022c40a8369

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As @Brent pointed out, IPAddress.TryParse

treats leading zeros as octal and will result in bad answers. One way to fix this problem is to use a RegEx.Replace

replacement. I personally like this one, which looks for 0 followed by any number of numbers.

Regex.Replace("010.001.100.001", "0*([0-9]+)", "${1}")

He will return 10.1.100.1

. This will only work if all text is an IP address.

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