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Re: st: Extracting substrings from variables.


From   brendan.halpin@ul.ie (Brendan Halpin)
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Extracting substrings from variables.
Date   Fri, 25 May 2012 19:17:29 +0100

On Fri, May 25 2012, Nick Cox wrote:

> . di regexm("Stata rules OK O1", "^637|642|O1")
> 1

OK, I was wrong that the grouping parentheses were unnecessary. However,
the way I used them first was also wrong.

Something like this is needed: 

. gen pright = regexs(0) if regexm(mdiag1x, "^(637|642|O1)")

More evidence that Nick's reluctance about regexp is not unwise. 

Brendan
-- 
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