php - How do you match one of two words in a regular expression?

Question

I want to match either @ or 'at' in a regex. Can someone help? I tried using the ? operator, giving me /@?(at)?/ but that didn't work

Answer 1

Try:

/(@|at)/

This means either @ or at but not both. It's also captured in a group, so you can later access the exact match through a backreference if you want to.