Regex to replace character in Javascript-CodePudding

I'm trying to create a regex to replace comma by a dot and only have one dot and delete all of the other ones, for example:

0,23433,222

Should return

0.23433222

123,33

Should return

123.33

CodePudding user response：

You can first replace the first comma with a dot and then remove the rest of the commas

let str = '0,23433,222';
str = str.replace(/,/, '.').replace(/,/g, '');
console.log(str);

CodePudding user response：

Just replace the first comma with a point and then remove all remaining commas. No regular expressions needed:

const str = "0,23433,222";
const res = str.replace(",", ".").replaceAll(",", "");

console.log(res);

CodePudding user response：

You can store the number of replaced commas in a variable, check whether it is 0 and increment it inside the replace callback:

let str = "0,23433,222", i = 0;

const res = str.replace(/,/g, c => !i   ? '.' : '')
console.log(res)