penders - 8:12 am on Oct 1, 2011 (gmt 0)
You should just be able to use them together, as in Readie's code above. Or are you finding that it's not working?
The "/" delimits the regular expression (regex). The "iu" are pattern modifiers and appear after the regex. The "\b" is an escape sequence that appears inside the regex and matches a word boundary (the position between a word and a non-word character).
So, in Readie's code, this becomes...
$rex = '/\b('.implode('|', $ignore).')\b/iu';