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Re: st: Regular expressions with locals


From   Nick Cox <njcoxstata@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Regular expressions with locals
Date   Tue, 26 Jun 2012 09:48:32 +0100

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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