正则表达式替换 Javascript 中的字符

Question

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 exemples:

0,23433,222

Should return

0.23433222

Or

123,33

Should return

123.33

Answer 1

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);

Answer 2

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);

Answer 3

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)