How to remove specific letters using regex in javascript

Question

var cartstring = "27,00 - R"

How can I remove spaces and "-" and "R" using only regex (not allowed to use slice etc.)? I need to make strings cartstring1 and cartstring2 which should both be equal to "27,00", first by removing spaces and "-" and "R", and second by allowing only numbers and ",".

cartstring1 = cartstring.replace(/\s/g, "");
cartstring2 = cartstring.replace(/\D/g, "");

Please help me modify these regular expressions to have a working code. I tried to read about regex but still cannot quite get it.
Thank you very much in advance.

You could also remove any char except digits or a comma [^\d,]+regex101.com/r/OcQvSP/1 — The fourth bird
– The fourth bird, Commented Oct 1, 2021 at 15:21

Alan Omar · Accepted Answer · 2021-10-01 15:23:52Z

2

you can just capture just what you are interested in number and comma:

let re = /[\d,]+/g
let result = "27,00 - R".match(re)
console.log(result)

answered Oct 1, 2021 at 15:23

Alan Omar

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1 Comment

h20002000 Over a year ago

Thanks all, that was very informative.

Spectric · Accepted Answer · 2021-10-01 15:29:52Z

1

You can group the characters you want to remove:

var cartstring = "27,00 - R"
let res = cartstring.replace(/(\s|-|R)/g, "")
console.log(res)

Or alternatively, split the string by a space and get the first item:

var cartstring = "27,00 - R"
let res = cartstring.split(" ")[0]
console.log(res)

edited Oct 1, 2021 at 15:29

answered Oct 1, 2021 at 15:22

Spectric

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The fourth bird · Accepted Answer · 2021-10-02 00:45:36Z

0

You are using 2 replacements, one replacing all whitespace chars \s and the other replacing all non digits \D, but note that \D also matches \s so you could omit the first call.

Using \D will also remove the comma that you want to keep, so you can match all chars except digits or a comma using [^\d,]+ in a single replacement instead:

var cartstring = "27,00 - R";
console.log(cartstring.replace(/[^\d,]+/g, ''));

answered Oct 2, 2021 at 0:45

The fourth bird

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