output

❯ babel-node parser.js
The CPU consists of integrated circuits in the microproces>sor of the computer. The CPU is responsible for processing information and controlling the computer.

parser.js

import tokenizer from 'string-tokenizer'
import chalk from 'chalk'

function tokenize (text) {
  return tokenizer()
    .input(text)
    .token('blank', /<<<.+?(?=>>>)/, values => values[0].replace(/^<<</, ''))
    .token('text', /.+?(?=<<<|$)/, values => values[0].replace(/^>>>/, ''))
    .resolve()
}

function formatBlank (blank) {
  return chalk.red.bold(blank)
}

function format ({text, blank}) {
  let result = ''
  const length = Math.max(text.length, blank.length)

  for (let i = 0; i < length; i++) {
    result += text[i] || ''
    result += formatBlank(blank[i] || '')
  }

  return result
}

function run (text) {
  const tokens = tokenize(text)

  console.log(format(tokens))
}

run('The CPU consists of integrated circuits in the <<<microproces>sor>>> of the computer. The CPU is responsible for <<<processing>>> information and controlling the computer.')