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st: RE: manipulating string variables


From   "Alex Ogan" <aogan@ArrowstreetCapital.com>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: manipulating string variables
Date   Fri, 21 Jul 2006 10:32:45 -0400

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


Hope this helps,
ALex

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Jean Eid
Sent: Friday, July 21, 2006 10:22 AM
To: stata
Subject: st: manipulating string variables

I have been trying to do the following with no luck (This is a 
simplification rather than exact procedure needed)

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.

If you know how to do this Please provide a workable example.


Thank you for your time

Jean

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