String variable dynamic bind-CodePudding

I have this code .replace(/^(\d{0,3})(\d{0,2})/, '($1) $2');.

I want to pass variable to make 3 dynamic.

I tried .replace(/^(\d{0,code.length})(\d{0,2})/, '($1) $2');

Thank you.

CodePudding user response：

You can use RegExp to fill your parameters up

const code = {
   length: 3
}
const regex = new RegExp(`^(\d{0,${code.length}})(\d{0,2})`)
console.log(regex)

CodePudding user response：

You can use concat regexp string with your variable like this

function replaceSymbols (str, symbols) {
  const regexp = new RegExp('12'   symbols, 'g')
  return str.replace(regexp, '-replace_string-')
}

const str = '123456'

console.log(replaceSymbols(str, ''));
console.log(replaceSymbols(str, '34'));
console.log(replaceSymbols(str, '345'));