findLongestWordLength.js

let findLongestWordLength = (str) => {
  let splitRegex = /[a-zA-z]+/gi
  let longest = 0;
  let words = str.match(splitRegex);
  for(let i = 0; i < words.length; i++ ) {
      let currWordLen = words[i].length;
      if(currWordLen > longest) {
        longest = currWordLen;
      }
  }
  return longest
}