I have been receiving an awful lot of spam from my online form lately, and I have read the posts on trying to prevent this but unfortunately my PHP skills are weak, and a lot of the info is over my head.

Therefore I have tried to create a regular expression check using the _regex form field, however this field/check seems to want to throw an exception no matter what I put in to the check. I even used the example given in the docs to check for date format and it didnt work.

Has anyone been able to get the _regex field to work?
Could someone provide me a regular expression to prevent html entities from being submitted to a comments field (This is really what I am wanting)

Thank you very much in advance for any help available.
Brian