Regular Expression Pattern With A Variable

I am using regular expression to check number of digits after decimal. This is working fine when it is used for two or three digits, for example \d{2} or \d{3}, but what if I need

Solution 1:

You can use RegExp, like;

//just an example though
var i = 2;
var pattern = new RegExp("\\d{"+i+"}$");

Solution 2:

You can write a function that generates the RegEx string with the parameter you provide for the number or decimal digits you need.

Solution 3:

What about just defining the range of the digits: \d{2,3}?

Solution 4:

This might be useful : 10+ Useful JavaScript Regular Expression Functions to improve your web applications efficiency