trimming - Removing only the last whitespace in string - Javascript -

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this question has answer here:

how can remove last whitespace (if there any) user input? example:

var str = "this   ";

how can remove last 1-4 whitespaces still keep first 2 whitespace (between this, , it)

question solved - lot!

using function this:

string.prototype.rtrim = function () {     return this.replace(/((\s*\s+)*)\s*/, "$1"); }

call:

str.rtrim()

addition if remove leading space:

string.prototype.ltrim = function () {     return this.replace(/\s*((\s+\s*)*)/, "$1"); }

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