Regular Expression

Regular Expression

by: Gsuttie

Regular Expression Tutorial

Within our business we have some rules for clientID's which must meet a certain length and format.

Within my project I created a class called Is.cs which I call when I want to check just what kind of client we have from the clientId entered in a textbox on the webpage.

Is.cs contains:

using System;
using System.Text.RegularExpressions;

Below is an example of some of the code I use within the project. I am checking here if the clientId is of TypeA and returns a boolean depending on the outcome. The code below is checking if the passed in string is 6 characters in length and has all numeric values.

public static bool IsTypeAId(string Value)
        {
            bool blnIs = false;
            blnIs = Regex.IsMatch(Value,
			      "^[0-9][0-9][0-9][0-9][0-9][0-9]$", 
RegexOptions.IgnoreCase);
            return blnIs;
        }

The code below is checking if the passed in string is 6 characters in length and starts with 2 letters followed by 4 numbers. The RegexOptions.IgnoreCase simply ignores case sensitivity and you can change this to check lower or upper case if the need arises.

public static bool IsTypeBId(string Value)
{
            bool blnIs = false;
            blnIs = Regex.IsMatch(Value,
			      "^[A-Z][A-Z][0-9][0-9][0-9][0-9]$", 
                RegexOptions.IgnoreCase);
            return blnIs;
}

Hope this is useful and slightly different from checking email address formats.

Any suggestions or comments you can email me at gsuttie@aol.com.

Thanks

Gregor