Help needed with a new measure

Hi all,

I'm trying to create a new measure that will return a filtered value. The problem i have is the filter needs to look at a values and determine if the values contain particular text. In my case, the values will be email addresses, and i need the filter to identify emails that belong to a certain domain, ie "@abcdef.com"

What is the dax expression that i need to use?

Help appreciated!