openBracketsAreClosed

verify.ts

let haveABrackets = /[\[\]()<>]/
const openBracketsAreClosed = {
  '(': /\(([^)]+)\)/,
  '<':  /<([^>]+)>/,
  '[': /\[([^\]]+)]/,
}
const closeBrackets = {
  '(': ")",
  '<': ">",
  '[': "]",
}
function verify(s: string) {
  let have = haveABrackets.exec(s)
  if (have) {
    let openBracket  = have[0]
    let getMiddle = openBracketsAreClosed[openBracket]
    if (getMiddle) {
      let haveMiddle = getMiddle.exec(s)
      if (haveMiddle) {
        let middle = haveMiddle[0]
        if (middle.length>3){
          return verify(middle.slice(1, -1))
        } else if (middle.length == 2){
          return middle[1] === closeBrackets[openBracket]
        }

      }
      if (s.length>have.index){
        return s[have.index+1] === closeBrackets[openBracket]
      }
      return false
    }
    return false
  }
  return true
}

test('', ({ plan, ok, end, pass, fail, equal }) => {
  ok(verify('---(++++)----'), true) //-> 1
  ok(verify(''), true) //-> 1
  ok(verify('before ( middle []) after '), true) //-> 1
  ok(!verify(') ('), false) //-> 0
  ok(!verify('<(   >)'), false) //-> 0
  ok(!verify('   (      [)'), false) //-> 0
  end()
})