title: How to validate Vimeo video id?
body: <p>I need to create a regular expression which could validate a valid Vimeo video.</p>
  
  <p>Accordingly to Vimeo API they use only numbers for Video Id, but they do not specify the length.</p>
  
  <p>My regular expression so far <code>var regEx= /^[0-9]+$/;</code></p>
  
  <p>I would like to know:
  - What is the allowed length supported by vimeo video id?
  - How to modify my regEx?</p>
  
  <p>Only article I found:
  <a href="https://vimeo.com/forums/topic:267078" rel="nofollow noreferrer">https://vimeo.com/forums/topic:267078</a></p>