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Re: st: browse if regexm(make,".")


From   Neil Shephard <[email protected]>
To   [email protected]
Subject   Re: st: browse if regexm(make,".")
Date   Tue, 29 Mar 2011 15:00:13 +0100

On Tue, Mar 29, 2011 at 2:54 PM,  <[email protected]> wrote:
> Dear Statalisters,
>
> Actually, I have this problem as well:
>
> ****
> sysuse auto
> browse if regexm(make,"A")==1        // it lists all string variables with a "A"
> browse if regexm(make,".")==1        // it lists everything instead of just the obs with a dot(".")
> ****
>

Thats because you don't know how to write regular expressions.

In most regular expressions the literal '.' is a wild card for
"anything", you want to escape it like...

browse if regexm(make,"\.")

(and you don't need the '==1' qualifier).

See more on regular expressions at
https://secure.wikimedia.org/wikipedia/en/wiki/Regular_expression and
note that Stata's implementation is POSIX 2 compliant as stated in
-man regexm()-

Neil

-- 
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to open the way to the next better one.” - Konrad Lorenz

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