I'd like to be able to filter questions based off of a participant's email address domain (participants will always have an email address registered in the panel). For example, this survey will be taken by people at two companies, and certain questions will only be displayed to one company or the other.

The current relevance equation I'm using looks like this:

So, if the participant's email is ' Cette adresse email est protégée contre les robots des spammeurs, vous devez activer Javascript pour la voir. ' it will compare the string following the '@' symbol. But this doesn't seem to be working. Is this the right way to do this? Is this even possible?

strstr() will return a string including the splitting character (needle).

Try: