advent of code help

demoData = `two1nine
eightwothree
abcone2threexyz
xtwone3four
4nineeightseven2
zoneight234
7pqrstsixteen`
let demoStrings = demoData.split(/\n/);

let wordNumObj = {
  one: 1,
  two: 2,
  three: 3,
  four: 4,
  five: 5,
  six: 6,
  seven: 7,
  eight: 8,
  nine: 9,
};

let numStr = "";
let numArr = [];
let splitStr = "";
let currentString = "";
let newStr ="";
function getNumbersFromStrings() {
  for (let i = 0; i < demoStrings.length; i++) {
    currentString = demoStrings[i].trim();
    for (let x = 0; x < currentString.length; x++) {
      splitStr += currentString.charAt(x);
      for (key in wordNumObj) {
        if (splitStr.match(key)) {
          numStr += wordNumObj[key];
          newStr = splitStr.slice(-1);
          splitStr = newStr;
        } else if (splitStr.match(wordNumObj[key])) {
          numStr += wordNumObj[key];
          splitStr = "";
        }
        // console.log(splitStr, 'and the iteration',i)
      } // end for key in wordNumbObj
    } // end loop for currentString.Length
  
      numStr = numStr.charAt(0) + numStr.charAt(numStr.length - 1);
      numArr.push(Number(numStr.trim()));
      numStr = "";
     
  } // end for loop for demoStrings

  const total = numArr.reduce((accumulator, currentValue) => {
    return accumulator + currentValue;
  }, 0);
  console.log(total, "is the total");
}
getNumbersFromStrings();

// the answer I got 53587 it is to low