Match and Return or Delete Content filter

Hi David,

Happy New Year to you. Hope you had a great Christmas.

I'm still hacking away at cleaning up the feeds for my site I was working on before Christmas. I wondered if you could tell me if there are any existing filters in PT which I could use to match a word/words in a field and replace the entire content of the field if matched but if there is no match then it would delete the entire content of the field? I searched the forum but all I can see are filters to delete the record if there is no match.

Thanks in advance.

Regards
Chris