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Re: Use of uninitialized value in substitution (s///)

by BrowserUk (Pope)
on Oct 06, 2011 at 23:57 UTC ( #930089=note: print w/ replies, xml ) Need Help??

in reply to Use of uninitialized value in substitution (s///)

Line 192 is "$ACETmpltDir = ~s/$ACEEnvironment//g;".

That should be $ACETmpltDir =~ s/$ACEEnvironment//g;. Pay careful attention to the spacing around =~.

What you have at the moment is trying to apply the substitution to $_; then apply logical not (*) bitwise negation (~) to the numeric result of that:

$_='aaaaa'; print s[a][]g;; 5 $_='aaaaa'; print ~s[a][]g;; 18446744073709551610

and finally assign (=) that to $ACETmpltDir, but it falls at the first hurdle because $_ is undefined.

(*)Corrected. Thanks to AnomalousMonk

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Re^2: Use of uninitialized value in substitution (s///)
by AvanTTix (Initiate) on Oct 07, 2011 at 00:02 UTC


    I totally overlooked this part of the syntax, even from the examples I looked up online.

      Happened to me just a few hours ago :)

      That really ought to be a warning, I can't imagine a use case where you want the bitwise negation of the number of substitutions  $foo = ~s/// or matches  $foo = ~m//

      every time I've encountered this in the past, its always been a mistake

      warnings should issue a specific warning

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