Extract strings from a javascript source file

parseString.js

function isFunction(potentialFunction) {
  return potentialFunction && Object.prototype.toString.call(potentialFunction) === '[object Function]';
}

function stringsReplace(str, callback) {
  if (isFunction(callback)) {
    str.replace(/(["'`])((?:(?=(\\?))\3.)*?)\1/gmi, (all, quote, value) => callback(value));
  }
  return str.replace(mustacheRegex, callback);
}

stringsReplace('simple quote value with an \' escape inside', value => console.log(value));
<- simple quote value with an \' escape inside