title: Javascript validation to allow maximum of 3 commas
body: <p>I want a Javascript validation that allows maximum of 3 commas in a text field user to enter a number or text in format</p>
  
  <p>123,456,789,0000</p>
  
  <p>meaning 3 Commas(,) are allowed, there could be any number of digits/letters between commas. User may choose to enter only 2 Commas i.e. 3 values but max number of Commas that would be allowed are 3
  for eg
  a,bb,ddddd,eeeee (4 tags)
  a,cc,bbbbb       (3 tags)</p>
  
  <p>What I am trying to achieve is user is allowed to enter only 4 comma separated tags thus making sure user cannot flood the article with 100's of tags</p>