Pattern Matching Javascript

pattern.js

// Example String
const stringy = "| ohtml | odiv | Hello World | cdiv | chtml |";

// Function that matches a string against a pattern
const matcher = (str) => {
  
  // declare some variables
  let tag;
  let split;
  
  // switch statement, if the string matched against regex is true
  switch (true) {
    case /\so[a-z]*\s/.test(str):
      split = str.split("");
      tag = split.slice(2, split.length - 1).join("");
      return `<${tag}>`;

    case /\sc[a-z]*\s/.test(str):
      split = str.split("");
      tag = split.slice(2, split.length - 1).join("");
      return `</${tag}>`;

    default:
      return str;
  }
};

// function that tokenizes/splits string then iterates over tokens assembling parsed string
const parse = (str) => {
  const strarray = str.split("|");

  let result = "";

  for (stry of strarray) {
    result += matcher(stry);
  }

  return result;
};

// Testing the code
console.log(parse(stringy));