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Re: st: Extracting substrings from variables.
From
Nick Cox <[email protected]>
To
[email protected]
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 <[email protected]> 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
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