How to remove specific letters using regex in javascript-CodePudding

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.

CodePudding user response：

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)

CodePudding user response：

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)