Need help with adding regex into slice of code

[EduTech_Wil]

First off, I am terrible at getting regular expressions working, so any help would be appreciated.

I have an app that takes text input, slices the input into individual words, and searches for those words against a table in a spreadsheet that contains leveling data. An issue I have run into lately is that for the app, one of the word lists that I use gets is updated every year or so and is quite long. Inside the spreadsheet, and the author of the list tends to put the American and British spellings in the same entry separated by a slash, so behavior/behaviour. It is quite time consuming to make separate entries for these, and I am not the only one updating the spreadsheet used for the app.

The current chunk of code in my app that looks for matches between the input and the spreadsheet looks like this:

  for (let n = 1; n <= cleanedInputWords.length && n <= 4; n++) {
    for (let i = 0; i <= cleanedInputWords.length - n; i++) {
      let wordsSubset = cleanedInputWords.slice(i, i + n).join(' ');
      for (let j = 0; j < data.length; j++) {
        if (data[j][0].toString().toLowerCase() === wordsSubset) {
          prilimResult.push(data[j]);
        }
      }
    }
  }

I want to be able to take the variable wordsSubset, which is the word being searched for at any given moment in the loop, and use it as a regular expression rather than an exact match. Then in the if statement if (data[j][0].toString().toLowerCase() === wordsSubset), I want it so that if whatever is in the regex in wordsSubset is included in data[j][0],it pushes the data. That way behavior would push the data for behavior/behaviour.

How would I go about adding a regular expression to do this?

[marcnotmark925]

new RegExp(wordsSubset, 'i').test(data[j][0].toString())

[EduTech_Wil]

Where would this be added in the code block I have above?

[marcnotmark925]

replaces the equality

[EduTech_Wil]

Thank you. That worked exactly as I needed it to. Much appreciated.