title: regular expression to print digits from specific location and prefix the digits with t
body: <p>I am very new to regular expression world and I have been trying to come up with a regular expression which will give me desired result. I have below pattern,</p>
  
  <blockquote>
    <p>:61:1503060306C1980,00F094033-86800<strong>0000114</strong>//1503060949876543</p>
  </blockquote>
  
  <p>My main goal is to take 7 digits before <code>//</code> (Highlighted in bold). So the output of above string should come as <code>t0000114</code>. I tried creating <code>\d{7}\b//</code> but it gave me output as <code>0000114//</code> and I am not sure how can we get rid of <code>//</code> as well as prefix <code>t</code> to result set. I am using Expresso to test the result. Thanks.</p>