title: Java Regular Expression removing everything but numbers from String
body: <p>I have two strings
  <code>string1 = 44.365 Online order</code>
  and <code>string2 = 0 Request Delivery</code>. Now I would like to apply a regular expression to these strings that filters out everything but numbers so I get integers like <code>string1 = 44365</code> and <code>string2 = 0</code>.</p>
  
  <p>How can I accomplish this?</p>