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Re: st: Regular expressions with locals


From   Anthony Hong <anthony.hong@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Regular expressions with locals
Date   Tue, 26 Jun 2012 11:01:07 -0400

Hey Nick, that's similar to what I am doing now, but I figured,
because I've never used regular expressions before, it would be an
opportunity to try it out.

Also, you guessed right.  That I'm trying to grab labels and make a table.

Would you know how I could do this with regular expressions though?

Because suppose the variable has an underscore in between it?  I would
like to be able to identify the portion between the first and last
underscore only and grab the text in between.



On Tue, Jun 26, 2012 at 4:48 AM, Nick Cox <njcoxstata@gmail.com> wrote:
> For the record, I give an orthodox non-regular expression solution.
> This example guesses that (a) Anthony wants to emit the output one
> variable at a time (b) he wants variable labels. Either guess could be
> wrong, naturally.
>
> * sandpit to play in
>
> set obs 3
> gen phstat = _n
> forval i = 1/3 {
>         gen _Iphstat_`i' = phstat == `i'
> }
>
> * transformation
>
>  forval i = 1/3 {
>         local in _Iphstat_`i'
>         local out : subinstr local in "_I" ""
>         local out : subinstr local out "_" " = "
>         label var `in' "`out'"
> }
>
>
> On Tue, Jun 26, 2012 at 5:33 AM, Anthony Hong <anthony.hong@gmail.com> wrote:
>
>> Hello!  I have in a local macro a list of variables such as _Iphstat_1
>> from xi: logistic.  I would like to remove the _I from the beginning
>> and the _# from the end and create a new local with simply a string
>> "phstat = 1".
>>
>> How might I go about doing this?
>>
>> I realize this can be done with various string functions, but I'm
>> curious about the regex commands.
>
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