On Thu, Sep 20, 2001 at 05:22:14PM +0530, Surarchitha Kumar Kudikyala wrote:
> I have a doubt whether it is possible to evaluate a pattern before using
> it in the pattern matching.
>
> For eg
>
> string =~ /$pattern/
>
> here $pattern is a pattern string contains some perl commands like
> lenght(str) etc. I want these commands to be evaluated, and the result of
> this evaluation has to be used in the actual pattern matching.
If $pattern contains Perl code then it's not a "pattern string", it's a
"Perl code string". To evaluate such a string you probably want eval:
my $code = 'length($str)';
my $pattern = eval $code;
$string =~ /$pattern/;
Read "perldoc -f eval", carefully.
However, using eval is generally a sign of poor design. What are you
trying to accomplish with this? Why do you think doing this sort of thing
is the solution?
Michael
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Administrator www.shoebox.net
Programmer, System Administrator www.gallanttech.com
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