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Re: st: How to extract text from Labels


From   Jörg Eulenberger <j.eulenberger@web.de>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: How to extract text from Labels
Date   Wed, 06 Jun 2012 08:40:33 +0200

Dear Nick,
it is being very usefull  to learn more about extended macro functions
and string functions.
Thanks a lot,
Jörg



Am 05.06.2012 19:00, schrieb Nick Cox:
> Almost daily, or so it seems, there are questions to which the answers
> are: use extended macro functions! use string functions! Here is
> another.
>
> Code something like this:
>
> foreach v of varlist <yourlist> {
>         local label : var label `v'
>         local first = strpos(`"`label"', "[") + 1
>         local second = strpos(`"`label'"', "]")
>         local newlabel = substr(`"`label'"', `first', `second' - `first')
>         label var `v' `"`newlabel"'
> }
>
> Or a regular expression approach
>
> foreach v of varlist <yourlist> {
>         local label : var label `v'
>         if regexm(`"`label'"'", "\[(.*)\]") {
>                 local newlabel = regexs(1)
>          }
>          label var `v' `"`newlabel"'
> }
>
> -save- the dataset first before you experiment.
>
> On Tue, Jun 5, 2012 at 4:50 PM, Jörg Eulenberger <j.eulenberger@web.de> wrote:
>
>> I have a problem with labels.
>>
>> In my Dataset are single items (binary) from a multiple option question.
>> The label format of this variables are “[Text1]Text2”. Now I want to
>> relabel the variables only with the Text in the square brackets (Text1).
>>
>> Any ideas for a syntax that i can use in a foreach-loop?
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