title: Can you use regex as validation for HTML fields via pattern attribute
body: <p>I am looking for an easy method of validating HTML fields such as standard postcodes etc. I would really prefer not to use JavaScript due to sheer ease and was hoping it would be possible to use complex regex in the pattern attribute of text inputs.</p>
  
  <p>If you have any better suggestions they are more than welcome.</p>
  
  <p>Thank you</p>