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


From   Grace Jessie <gracejessie@hotmail.com>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: AW: Using regex to identify strings with capital letters
Date   Sat, 29 May 2010 15:31:50 +0000

Martin,
"the "^" sign indicates that the "P" character must be positioned at the beginning of the  string"
Could you please tell where to look up the use of sign in -regex-, such as "^","$"?
Thank you very much!
 
Regards,
Grace
 

> From: martin.weiss1@gmx.de
> To: statalist@hsphsun2.harvard.edu
> Subject: st: AW: Using regex to identify strings with capital letters
> Date: Thu, 27 May 2010 14:37:21 +0200
> 
> 
> <> 
> 
> " These
> records I don't want, but easily dropped by modifying Martin's
> suggestion:
> drop if regexm(substr(var1,1,2) , "^([P][O])")"
> 
> 
> 
> 
> You can probably safely omit the -substr()- part here as the "^" sign
> indicates that the "P" character must be positioned at the beginning of the
> string. See http://www.stata.com/support/faqs/data/regex.html
> 
> 
> 
> *************
> clear*
> 
> input str5 myvar
> "POwll"
> "POert"
> "SEtrt"
> "WEret"
> end
> 
> preserve
> drop if regexm(substr(myvar,1,2) , "^([P][O])")
> l, noo
> restore
> 
> drop if regexm(myvar , "^([P][O])")
> list, noo
> 
> *************
> 
> 
> 
> HTH
> Martin
> 
> 
> -----Ursprüngliche Nachricht-----
> Von: owner-statalist@hsphsun2.harvard.edu
> [mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von Beecroft, Erik
> (VDSS)
> Gesendet: Donnerstag, 27. Mai 2010 14:26
> An: statalist@hsphsun2.harvard.edu
> Betreff: st: Using regex to identify strings with capital letters
> 
> Thank you to Martin and Nick for solving my problem, Martin with the
> regexm function and Nick with inrange.
> 
> Both of these work with my data:
> keep if regexm(substr(var1,1,2) , "^([A-Z][A-Z])")
> keep if inrange(substr(var1,1,1), "A", "Z") &
> inrange(substr(var1,2,1), "A","Z")
> 
> Both also keep records that begin with "PO" for Post Office box. These
> records I don't want, but easily dropped by modifying Martin's
> suggestion:
> drop if regexm(substr(var1,1,2) , "^([P][O])")
> 
> Thank you for your help.
> 
> Erik
> 
> 
> Martin is correct that -inrange("Er", "AA", "ZZ")- is true. Possibly
> this is Erik's specific problem, namely that having the first capital
> letter in "A" ... "Z" is necessary but not sufficient. 
> 
> I offer as a stronger criterion 
> 
> inrange(substr(myvar,1,1), "A", "Z") & inrange(substr(myvar,2,1), "A",
> "Z")
> 
> I continue to like regex solutions when they are the simplest available!
> 
> Nick 
> n.j.cox@durham.ac.uk 
> 
> 
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