title: Returning only part of match from Regular Expression
body: <p>Say I have the string "User Name:firstname.surname" contained in a larger string how can I use a regular expression to just get the firstname.surname part?</p>
  
  <p>Every method i have tried returns the string "User Name:firstname.surname" then I have to do a string replace on "User Name:" to an empty string.</p>
  
  <p>Could back references be of use here?</p>
  
  <p>Edit:</p>
  
  <p>The longer string could contain "Account Name: firstname.surname" hence why I want to match the "User Name:" part of the string aswell to just get that value.</p>