Highlight text

highlight.js

/**
 * Escape Regex if string has any symbols
 * @param {String} input input string to escape
 */
const escapeRegExp = input => {
  if (/\W|[_]/g.test(input)) {
    return input.replace(/\W|_/g, '[$&]')
  }

  return input
}

/**
 * Highlight text
 * @param {String} source source string to be highlighted
 * @param {String} input input string to escape
 */
export const highlightText = (source, input) => source.replace(new RegExp(escapeRegExp(input), 'gi'), '<em>$&</em>')