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Re: Yet Another Variable Expansion Problem

by extremely (Priest)
on Apr 12, 2002 at 20:12 UTC ( #158659=note: print w/replies, xml ) Need Help??

in reply to Yet Another Variable Expansion Problem

Well, if you would change the match to something like the following and have him stick all the variables in a namespace other than main:: you'd be better off than you are. The key trick is requiring a real word character after the '$'. $template =~ s/\[\$([a-zA-Z][\w\[\]\{\}'"]*)\]/'$Q::'.$1/eeg;

Basically, lop off the '$' too, make sure the first character is really a letter (and that one exists, yours allows [$] which isn't real good), and stuff that string onto a variable in another namespace.

If you are sure that every variable is a scalar you might just do /\[\$([a-zA-Z]+)\]/$hash{$1}/eg; as well.

And yes, I'm ashamed that I'm on the Template-Toolkit list and still helping you do this the wrong way. =) =)


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[hippo]: Ah
[Corion]: But maybe there is some other Unicode string that will be true but have a zero width
[hippo]: For explanation, I've seen this construct in someone else's code (no names, no pack drill) and couldn't think of a situation to trigger it.
[Corion]: You'll have to look somewhere esoteric for that. Maybe some tied variable or special dualvar can also trigger that. But it's certainly not a common occurrence
[Corion]: And on 5.20, the following also outputs no find:perl -wle 'for my $x ("\x{2000}".."\ x{1fffff}") { if( $x && ! length $x ) { warn qq(<$x>); warn length $x; die } }'
[Corion]: (this time on Unix)
[hippo]: Understood. I'll have to go through the code and see if it's doing anything fancy with ties, dual-vars or non-scalars. In the end, it's probably a bug though.

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