validate IP address

Posted Date: 08 May 2008 Resource Type: Code Snippets Category: C# Syntax

Posted By: narasimha Member Level: Gold
Rating:

Points: 5

1.
public bool IsValidIP(string addr)
2.
{
3.
//create our match pattern
4.
string pattern = @"^([1-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])(\.
5.
([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])){3}$";
6.
//create our Regular Expression object
7.
Regex check = new Regex(pattern);
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//boolean variable to hold the status
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bool valid = false;
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//check to make sure an ip address was provided
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if (addr == "")
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{
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//no address provided so return false
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valid = false;
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}
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else
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{
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//address provided so use the IsMatch Method
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//of the Regular Expression object
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valid = check.IsMatch(addr, 0);
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}
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//return the results
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return valid;
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}

For more details, visit http://www.eggheadcafe.com/community/aspnet/2/10034676/try-this.aspx

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