Regex Issue in Siebel application <p>I want to mask DL number when I get an email from auser. I want to use an existing reqular expression in my Siebel application. I have a regex from the existing application like this:</p> <pre><code>([\s.,:])(\d{7,9})([\s.,:]) </code></pre> <p>This expression is masking all the charcters in the DL number. But I want to display only the last 4 digits in the DL number.Could you please help me to complete the functionality?</p> <p>The above expression is masking 7, 8, and 9-digit numbers. I would like to display only the last 4 digits.</p>