Re: st: Rename

[Ronnie Babigumira <rb.glists@gmail.com>]

Thanks Nick. I have kept putting off my plunge into the world of regular expressions, this is a welcome incentive to do so.

Ronnie

Nick Cox wrote:
> Eva's solution is fine. I too am a great fan of using -strpos()-,
> -substr()- and -subinstr()- for basic string manipulation. 
> I thought nevertheless it would be of interest to look at a regex
> solution -- partly because Ronnie may one day soon have a problem that
> does not quite fit his original specification. 
> foreach x of var r* { 
> 	if regexm("`x'", "(r[0-9]+)(k[0-9]+)") { 
> 		rename `x' `=regexs(2)'`=regexs(1)' 
> 	}
> } 
> That flips all varnames of the form r<digits>k<digits> to
> k<digits>r<digits>. 
> Nick
> n.j.cox@durham.ac.uk 
>
> Eva Poen
>
> here is one way to do it.
>
> foreach x of varlist r1* {
>    local end = substr("`x'",-2,.)
>    local start = subinstr("`x'","`end'","",1)
>    rename `x' `end'`start'
> }
>
> Ronnie Babigumira 
>
> > How do I rename some variables by switching letters around.
> >
> > As an example, I would like to rename r1k4 r12k4 to k4r1 and k4r12, so
> take
> > the last two characters and put them at the beginning and put whatever
> is
> > left at the end.
>
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