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st: RE: RE: manipulating string variables


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: RE: manipulating string variables
Date   Fri, 21 Jul 2006 15:37:39 +0100

To Alex's clear exposition two footnotes can be added. 

1. In Stata terminology, these are not variables at 
all, but (global) macros. 

2. In Stata 9, -index()- is documented as -strpos()-. 

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

Alex Ogan
 
> Here are some basic examples:
> 
> . clear
> 
> . global testglobal "hello world, how are you today"
> 
> . display "$testglobal"
> hello world, how are you today
> 
> . display index("$testglobal","you")
> 22
> 
> . display index("$testglobal","me")
> 0
> 
> . global testglobal2 = subinstr("$testglobal","today","tomorrow",.)
> 
> . display "$testglobal2"
> hello world, how are you tomorrow
 
Jean Eid
 
> Suppose I declare a global variable
> global myglobal "hello world, how are you today"
> 
> now what I want to do is the following:
> a) see whether the string text today exist in $myglobal
> b) replace "today" by "tomorrow"
> c) instead of "are" I need to change the "a" to "b" let's say.
> 
> I know this does not make sense to you right now but I have all these 
> regressions defined as global variables and need to manipulate them.
> 
> Can this be done in Stata?
> 
> I have checked strmatch and the likes but am not able to work 
> it. I am 
> looking for something like grep, sub and the likes in Linux.

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