title: miliseconds replace from 6 to 3 decimals with javascript jquery
body: <p>I need to replace 02:04.887004 to 02:04.887 with jquery or js.</p>
  
  <p>Other times I have microseconds just with four decimals (02:04.8348) and I would have 02:04.834</p>
  
  <p>I would use regexp to find $:[d][d].$ and then return it but with the three decimals</p>