title: preg_replace - strip unwanted characters from string to return numeric value
body: <p>I hate regular expressions and I was hoping someone could help with a regualar expression to be used with preg_replace.</p>
  
  <p>I want to strip unwanted characers from a string to return just a numeric value using preg_replace.</p>
  
  <p>The string format could be as follows:</p>
  
  <p>SOME TEXT £100</p>
  
  <p>£100 SOME TEXT</p>
  
  <p>SOME TEXT 100 SOME TEXT</p>
  
  <p>Many thanks</p>