How to identify a regular expression

This question already has an answer here:

Is there a regular expression to detect a valid regular expression? 8 answers

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Assuming you want to target a source (ex: an article) and want to check which words are used most commonly in that source:

Assume the whole block of texts in the articles are in one string, assigned to variable "str":

// Will be used to track word counting
const arrWords = [];
// Target string
const str = 'fsdf this is the article fsdf we are targeting';
// We split each word in one array
const arrStr = str.trim().split(' ');

// Lets iterate over the words
const iterate = arrStr.forEach(word => {
  // if a new word, lets track it by pushing to arrWords
  if (!arrWords.includes(word)) {
    arrWords.push({ word: word, count: 1 });
  } else {
    // if the word is being tracked, and we come across the same word, increase the property "count" by 1
    const indexOfTrackedWord = arrWords.indexOf(word);
    arrWords[indexOfTrackedWord].count++;
  }
});

// Once that forEach function is done, you now have an array of objects that look like this for each word: 
arrWords: [
  {
    word: 'fsdf',
    count: 2
  },
  {
    word: 'this',
    count: 1
  },
  // etc etc for the other words in the string
];

Now you can just console.log(arrWords) to look at the results!

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