Dropping observations in a variable with a shared suffix

[Claire Wilson]

Very simple question but the suggestions from google (and this forum) have failed to provide a solution.
I have a variable 'xxx' and I want to delete observations ending in "P2" within that variable.
I have tried: 1) drop if xxx=="*P2"
2) drop if xxx=="_P2"
3) drop if xxx=="*_P2"
4) drop if xxx=="_*P2"
But to no avail.
Any suggestions where I am going wrong? Perhaps some clarification on the correct truncation/wildcard.
Many thanks.

[Andrew Musau]

drop if regexm(xxx, "P2$") == 1

[Rich Goldstein]

an alternative:

drop if substr(xxx,-2,.)=="P2"

[Nick Cox]

Rich's solution is fine but you know you want the last two characters, then you can also write in terms of

substr(xxx, -2, 2)

[Claire Wilson]

Thank you Andrew Musau, Rich Goldstein and Nick Cox!

[Mary Atieno]

Rich's solution is fine but you know you want the last two characters, then you can also write in terms of

substr(xxx, -2, 2)

What if I want to delete observations starting (not ending) with P2?

[Nick Cox]

 drop if substr(xxx,1,2)=="P2"