How to check whether a file name contains GUID or not

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File name is text1eb4617fd-4876-4c52-aa5b-21f8be8fb0f8.txt
it should return true because it contains GUID

If File name is text1eb4617fd-4876-f8.txt or text1.txt
it should return false as it does not contain any GUID

Posted 27-Oct-15 21:31pm

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phil.o · Answer 1 · 2015-10-27T21:44:00

A regular expression would be perfect for that:

C#

using System.Text;

string pattern = @"^text(?<guid>[0-9a-zA-Z]{8}-[0-9a-zA-Z]{4}-[0-9a-zA-Z]{4}-[0-9a-zA-Z]{4}-[0-9a-zA-Z]{12})\.txt$";

Regex regex = new Regex(pattern, RegexOptions.Compile | RegexOptions.CultureInvariant);

string input1 = "text1eb4617fd-4876-4c52-aa5b-21f8be8fb0f8.txt";
string input2 = "texteb4617fd-4876-4c52-aa5b-21f8be8fb0f8.txt";

bool input1Matches = regex.IsMatch(input1); // input1Matches will be false
bool input2Matches = regex.IsMatch(input2); // input2Matches will be true

As a bonus, if you want to get the Guid, it is a simple as:

C#

Match m = regex.Match(input2);
Guid guid = Guid.Parse(m.Groups["Guid"].Value);

Note: the Guid you are presenting is not a valid one: its first block should hold exactly 4 bytes, buty the example you give would need 5 bytes to store 1eb4617fd. That's why I used two string variables in my example.

Hope this helps.

PANKAJMAURYA · Answer 2 · 2015-10-27T21:54:00

Try This one

C#

protected void Page_Load(object sender, EventArgs e)
   {

       bool a = IsHavingGUID("text1eb4617fd-4876-4c52-aa5b-21f8be8fb0f8.txt");
       bool b = IsHavingGUID("text1.txt");
   }

   public bool IsHavingGUID(string input)
   {
       MatchCollection guids = Regex.Matches(input, @"(\{){0,1}[0-9a-fA-F]{8}\-[0-9a-fA-F]{4}\-[0-9a-fA-F]{4}\-[0-9a-fA-F]{4}\-[0-9a-fA-F]{12}(\}){0,1}");
      return guids.Count>0;
   }

How to check whether a file name contains GUID or not

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