title: regex to split number from string
body: <p>How to split and select which is number using regex. User can enter string like:</p>
  
  <p>1dozen
  3 dozen
  dozen1    &lt;= unlikely but assume user will type that too</p>
  
  <p>30/kg</p>
  
  <p>I still find out with the incomplete one:</p>
  
  <pre><code>/[a-z](?=\d)|\d(?=[a-z])/i
  </code></pre>
  
  <p>But missing space and forward slash. Can anyone help me?</p>