Question

I’m trying to write the code so it removes the “bad” words from the string (the text).

The word is “bad” if it has comma or any special sign thereafter. The word is not “bad” if it contains only a to z (small letters).

So, the result I’m trying to achieve is:

<script>
String.prototype.azwords = function() {
   return this.replace(/[^a-z]+/g, "0");
}

var res = "good Remove remove1 remove, ### rem0ve? RemoVE gooood remove.".azwords();//should be "good gooood"
//Remove has a capital letter
//remove1 has 1
//remove, has comma
//###  has three #
//rem0ve? has 0 and ?
//RemoVE has R and V and E
//remove. has .
alert(res);//should alert "good gooood"
</script>

Answer 1

Try this:

return this.replace(/(^|\s+)[a-z]*[^a-z\s]\S*(?!\S)/g, "");

It tries to match a word (that is surrounded by whitespaces / string ends) and contains any (non-whitespace) character but at least one that is not a-z. However, this is quite complicated and unmaintainable. Maybe you should try a more functional approach:

return this.split(/\s+/).filter(function(word) {
    return word && !/[^a-z]/.test(word);
}).join(" ");