javascript - Regex for number between 0.0 to 0.999 onkeyup -

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I am trying to validate a decimal number from 0.0 to 0.9 99 or .0 to .999.

I'm trying below 

  $ ('# num'). On ("keyup", function () {var value = $ (this) .val (); var regex_cell = / 0 (\\\\ [0-9] {3})? /; If (! Value.match (Regex_cell)} {this.value = this.value.replace (this.value.slice (-1), "");}}); Instead of using Regex, you can convert to float and validate it.    
 
  var s = "0.999"; Var n = number Parallel (s); If (n> = 0 & amp; amp; amp; amp; n & lt; = 0.999) // 3 decimal position only? S.length & lt; = 4 {// valid}

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