st: RE: Using regex to identify strings with capital letters

["Nick Cox" <n.j.cox@durham.ac.uk>]

You don't need regex for this. 

... if inrange(substr(myvar,1,2), "AA", "ZZ") 

should be enough, or even "AK" to "WY" or whatever it is. (Remember this
is an international list!) 

Nick 
n.j.cox@durham.ac.uk 

Beecroft, Erik (VDSS)

I need to extract certain observations from a series of text files.
Each file contains only one variable, which is string.  The
observations I want all begin with two capital letters. (They are state
abbreviations, such as VA or AK).  The other observations do not begin
with two capital letters.

Is there a way to tell Stata to keep only observations for which the
variable begins with two capital letters?

It seems like the regex function might work, but I have never worked
with regular expression syntax before.  

For example, a portion of a text file might look like:
	text1
	text2
	VA department of Social Services
	text4
	text5

I want to keep only the third observation above.

I am using Stata for Windows 10.1.

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