keep observations if first 2 character of the string is capital letter

[George Paily]

I have a dataset where the variable x is a string. I need to keep only observations at which the first 2 characters in the variable x is capital letter. Can anyone tell me how to do it ?

[daniel klein]

Here is one way:

keep if usubstr(x, 1, 2) == ustrupper(usubstr(x, 1, 2))

The approach assumes that each observation in x has at least two characters and that the third character and any other characters following are irrelevant.

[Andrew Musau]

Daniel's approach is general, but the following should work if one is dealing with the English alphabet:

keep if regexm(x, "^[A-Z][A-Z]")

[George Paily]

thank you so much, Andrew and Daniel