Javascript Regex Whitelist with character limit

Question

I'm trying to add a character limit clause to this white list regex approach

str = str.replace(/[^A-Za-z-_0-9 ]/g, "");

Is it possible and how do I do it?

Answer 1

str = str.replace(/[^A-Za-z-_0-9\s]/g, "").substring(0,10);  //At most 10 chars

Answer 2

Use a quantifier to specify the limit.

If you want a maximum (10 for example) do this:

str = str.replace(/[^A-Za-z-_0-9 ]{,10}/g, "");

A minimum:

str = str.replace(/[^A-Za-z-_0-9 ]{10,}/g, "");

A range:

str = str.replace(/[^A-Za-z-_0-9 ]{8,10}/g, "");

An exact quantity:

str = str.replace(/[^A-Za-z-_0-9 ]{10}/g, "");