title: RegEx validation of decimal numbers with comma or dot
body: <p>How to validate such number input with one RegEx. Strings are not allowed. Two decimal positions after dot or comma.</p>
  
  <p>Example:</p>
  
  <blockquote>
    <p>123.34<br>
    1.22<br>
    3,40<br>
    134,12<br>
    123</p>
  </blockquote>