Compare array of words to a textarea input with javascript

Question

I have a textarea inside a form.

Before the form is submitted, the textarea is validated and checked so it is not empty, not over 2000 characters, not contain forbid

Answer 1

If you wanted to check for the presence of "expletive1" and "expletive2" you'd do the following:

my_textarea = document.getElementById('textarea_id');

if (/\b(?=\w)(expletive1|expletive2)\b(?!\w)/i.test(my_textarea.value)) {
    // we found bad words!  do something
} else {
    // no bad words found, carry on, nothing to see here
}

And you'd just add more words to the list in the same manner (expletive1|expletive2|expletive3|expletive4)

Keep in mind that to keep the words out of your app entirely you'll also need to do server-side filtering.