title: Regex to get float from a string
body: <p>Hay, i have a system basically tracks finances. In this application it has a "cost" field (which unfortunately is VARCHAR field). This field has various values entered like:</p>
  
  <pre><code>£90
  £210 per day
  £50 per logo
  Design - £180
  £36 p/h
  £1009.51
  </code></pre>
  
  <p>Is there any way i can convert these to floats? I tried just using (float) to juggle the type into a float, but it isn't working.</p>