eval() doesn't do what you want - it *executes* code, as opposed to
substituting values for variables. Try something like:
my $template = '^<!-- // begin of news%no% // !-->$';
my $no = 99;
my $bla = $template;
$bla =~ s/%no%/$no/g;
You can get fancy too, if you want:
$replace{no} = 99;
$bla =~ s/%(.+?)%/$replace{$1}/g;
now anything encased in % signs will be replaced by the associated value
in the %replace hash.
Disclaimer: these are trivial and not terribly robust solutions; take them
as a starting point, not a complete solution.
----------------------------------------------------------------------
Andrew J Perrin - andrew_perrin@unc.edu - http://www.unc.edu/~aperrin
Assistant Professor of Sociology, U of North Carolina, Chapel Hill
269 Hamilton Hall, CB#3210, Chapel Hill, NC 27599-3210 USA
On Sat, 21 Jul 2001, Sven Burgener wrote:
> On Sat, Jul 21, 2001 at 01:46:25PM +0200, Joost Kooij wrote:
> > On Sat, Jul 21, 2001 at 01:04:40PM +0200, Sven Burgener wrote:
> > > my $BEGINREGEX = "sprintf(\"^<!-- // begin of news\$no // !-->\$\")";
> >
> > Please tell us what you're trying to accomplish first. It is unclear
> > what assumptions you are making.
>
> What I want is the variable $BEGINREGEX to contain a string like so:
>
> ^<!-- // begin of news1 // !-->$
>
> or
>
> ^<!-- // begin of news2 // !-->$
>
> The digit after the "news" should be whatever $no is set to at that
> point in the script.
>
> > > my $no = 1;
> > > my $bla = eval($BEGINREGEX);
> > > print "$bla\n";
> > >
> > > $bla is empty for some reason.
> >
> > You probably do not want to use eval here, or at least not in this way.
>
> What should I do then?
>
> It's simple, really. I am sure I am just making a stupid mistake.
>
> my $BEGINREGEX = "sprintf(\"^<!-- // begin of news\$no // !-->\$\")";
> my $no = 99;
> my $bla = eval($BEGINREGEX);
> print "regex string: $bla\n";
>
> What should be printed:
>
> regex string: ^<!-- // begin of news99 // !-->$
>
>
> But it isn't, so what am I doing wrong here?
>
> Cheers,
> Sven
> --
> The best way to escape from a problem is to solve it.
>
>
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