Anonymous Monk has asked for the wisdom of the Perl Monks concerning the following question:

I need to do simple substitution using the keys and values of a hash table. But I'm new and can't get it to work. I just want the script to check for a "key" in the hash, and replace it with its corresponding "value." Any help??

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Re: substituting with hash data
by Cirollo (Friar) on Aug 16, 2001 at 18:04 UTC
    Something like this perhaps? 
    $string =~ s/$_/$hash{$_}/g for (keys %hash);

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Re: substituting with hash data
by Masem (Monsignor) on Aug 16, 2001 at 18:05 UTC
    It should be a simple substitution: 
    $a  = "this is a test";
%b = ( is => 'was' );
foreach my $key ( keys %b ) {
   $a =~ s/$key/$b{$key}/g;
}
print $a,"\n";
# output:      thwas was a test

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    -----------------------------------------------------
    Dr. Michael K. Neylon - mneylon-pm@masemware.com || "You've left the lens cap of your mind on again, Pinky" - The Brain

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Re: substituting with hash data
by davorg (Chancellor) on Aug 16, 2001 at 18:06 UTC

    Do you mean something like:

    my $srch = join ('|', map {'\b.'quotemeta($_).'\b'} keys %trans);
$text =~ s/($srch)/$trans{$1}/g;

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    Looks like you're writing your own templating system. There are plenty of them on CPAN, why not look for one there.

    --
    <http://www.dave.org.uk>

    Perl Training in the UK <http://www.iterative-software.com>

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      Speaking of which... if you're looking to do HTML templating, you might take a look at this nice overview of your options (written by perrin): Choosing a Templating System
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