JavaScript regular expression to remove comma in number comma number

Question

"12,56,7abc,fgh" ===> "12567abc,fgh"
"1,245abc,1a" ===> "1245abc,1a"
"1,2,3,4,5abc" ===> "12345abc"

How to remove comma in (number),(number) format?

For the test

const array = ["12,56,7abc,fgh", "1,245abc,1a", "1,2,3,4,5abc"]
const answer = ["12567abc,fgh", "1245abc,1a", "12345abc"]

function formatter(string){
   // here
   return // string.replace('', '') ??
}

array.map((el, i) => { 
   const formatted = formatter(el) 
   if(answer[i] === formatted){
      console.log('Success. formatted: ', formatted)
   } else {
     console.log('Failed. formatted: ', formatted)
   }
})

Does this answer your question? Remove all occurrences except last? — PM 77-1
– PM 77-1, Commented Jun 10, 2020 at 23:54
What is the logic for "12345abc" result? How exactly is it different from "12567abc,fgh"? — PM 77-1
– PM 77-1, Commented Jun 10, 2020 at 23:56

user1111 · Accepted Answer · 2020-06-11 02:27:58Z

2

str.replace(/(?<=\d),(?=\d)/g, '')

(?<=\d): lookbehind - a digit

(?=\d) : lookahead - a digit

answered Jun 11, 2020 at 2:27

user1111

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