javascript - Regex expression is not working? -

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I am trying to create a regex expression with this requirement.

Requirement:

Maximum Length - 5 (inc decimal point if decimal number is)

Decimal Accession - Maximum 2 digits (if it is a decimal number).

Number - no need to be a decimal number (not mandatory)

Code: 

 < Code> & lt; Script & gt; Function myFunction () {var regexp = / ^ (????? \\.? $) \ D {0,5} (\. \ D {0,2})? $ /; Var num = 12345.52; // I will test indifernt methods var n = regexp.test (num) document.getElementById ("Demo") here. InnerHTML = n; // returns true or false} & lt; / Script & gt;   
  The output should look like:   
 12345.52 - & gt; It should be returned to  false  because length is 8 inc dot but this return  true   
 123456.52 - & gt; false . I found out  d {0,5}  looking for decimal before  
 12.45 - & gt; truth . Correct One (Length 5, Precision 2)  
 12345 - & gt; truth .  
 I am hoping to make a Rizax expression, I satisfy all the above situations.  
 Reference:   
 
 
 You can use the regex given below.  
  ^ (? =. {1,5} $) \ D + (?: \. \ D {1,2})? $   
  
  Explanation:   
     
  •   ^  assures That we are in the beginning  
  •   (? =. {1,5} $)  indicates that the length should be from 1 to 5.  
  •  Allows  \ d +  one or more digits.  
  •   (?: \. \ D {1,2})?  After the decimal point, the optional decimal part should be one or two with acceptable digits.  
  •   $  indicates that we are at the end of the line

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