darn, constants are not interpolated in strings or regexes.

As I understand it, even with use constant, a constant in Perl is an in line sub. IE: 

use constant PI    => 4 * atan2(1, 1);

[download]

is the short hand for

sub PI
{
    4 * atan2(1, 1);
}

[download]

Which, after compile time constant expression evaluation, simplifies to:

sub PI
{
    3.1415926536; # to the precision available on the machine running 
+the program
}

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which the compiler can then in line where it would otherwise put a sub call.

In reply to Re^4: Unmatched [ in regex; marked by <-- HERE in m/[ <-- HERE ^]/ (updated) by RonW
in thread Unmatched [ in regex; marked by <-- HERE in m/[ <-- HERE ^]/ by madM

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