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Re: st: Extracting substrings from variables.


From   Nick Cox <njcoxstata@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Extracting substrings from variables.
Date   Fri, 25 May 2012 19:22:55 +0100

As any leading spaces surely don't matter, consider using

regexm(ltrim(mdiag1x), "^(637|642|O1)")

Nick

On Fri, May 25, 2012 at 7:17 PM, Brendan Halpin <brendan.halpin@ul.ie> wrote:
> 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
> --
> Brendan Halpin,   Department of Sociology,   University of Limerick,   Ireland
> Tel: w +353-61-213147  f +353-61-202569  h +353-61-338562;  Room F1-009 x 3147
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