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This is a snippet I use to validate IP address using regular expressions. I use this when working in .Net 1.1 as the TryParse method isnt available until 2.0
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Submitted By: PsychoCoder
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Rating:
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Views: 14,680 |
Language: C#
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Last Modified: October 31, 2007 |
Instructions: Pass the method an ip address. Add
using System.Net
To your code file |
Snippet
/// <summary> /// method to validate an IP address /// using regular expressions. The pattern /// being used will validate an ip address /// with the range of 1.0.0.0 to 255.255.255.255 /// </summary> /// <param name="addr">Address to validate</param> /// <returns></returns> public bool IsValidIP(string addr) { //create our match pattern string pattern = @"^([1-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])(\. ([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])){3}$"; //create our Regular Expression object Regex check = new Regex (pattern ); //boolean variable to hold the status bool valid = false; //check to make sure an ip address was provided if (addr == "") { //no address provided so return false valid = false; } else { //address provided so use the IsMatch Method //of the Regular Expression object valid = check.IsMatch(addr, 0); } //return the results return valid; }
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