Javascript: magic with replacing a whitespace in a string

Question

I cannot remove a whitespace in a string if a variable contains that value:

var groupingSeparator = ' '; '123 456'.replace( new RegExp( groupingSeparator ), '' ); >>> as result: '123 456'

But I can do it without a separate variable:

'123 456'.replace( new RegExp( ' ' ), '' ); >>> as result: '123456'

I need this variable because it could also contain another value (comma, point and go on). So why we have a different behavior in the "equals" code examples? How to solve it?

EDIT: So it does not work for me locally because the value of the groupSeparator variable is not a simple whitespace. It is '\u00A0'.

'123 456'.replace( new RegExp( groupingSeparator ), '' ); yields 123456 — Wiktor Stribiżew
– Wiktor Stribiżew, Commented Dec 3, 2018 at 11:49
@WiktorStribiżew You are right. Maybe it is an issue with my local code... — Paul
– Paul, Commented Dec 3, 2018 at 11:51
Don't forget to assign the replaced value: str = str.replace( new RegExp( g ), '' ); — vrintle
– vrintle, Commented Dec 3, 2018 at 11:53
So it does not work for me locally because the value of the groupSeparator variable is not simple whitespace. It is '\u00A0'. — Paul
– Paul, Commented Dec 3, 2018 at 12:13

barbsan · Accepted Answer · 2018-12-03 12:46:52Z

Use \s as separator - it matches whitespaces. Note that you need to add "\" to use it with RegExp constructor. I've also added g flag (global) to replace all matches in given string

var groupingSeparator = '\\s'; var text = '123\u00a0456' console.log("before", text) var result = text.replace( new RegExp( groupingSeparator , "g"), '' ); console.log("after", result)

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