Thanks very much for the quick review and comments. :)
1) as of now just adde...

Thanks very much for the quick review and comments. :)

1) as of now just added a textarea to add the wordlist to ignore like you said with space and on "Webform settings" page and could be configured with settings.php, because it is now using variable_get.

2) use preg_quote to protect from regex, I am not sure the place you are referring at. but the all preg_replace is called with regex pattern, so we may not use there, and for $ignore_words_regex we are using \b with each words. so, we may not use that with those words (I tried but didn't work out as expected.)

Rest of the comments are followed and made necessary changes.