qr//e?

[Tkil]

~sdpm~

Fellow mongers:

Can anyone think why /e might be a bad idea to suggest for addition to
the qr// operator?

I found myself doing something like this, the other day:

   my @days    = qw( Sun Mon Tue Wed Thu Fri Sat );
   my $days_re = qr/join '|', @days/e;

And I was startled to discover that qr doesn't have a /e flag.
Granted, it has only ever been in the substitution part of s///, but
this seems pretty straightforward.  There are obvious workarounds:

   my $days_re = do { my $tmp = join '|', @days; qr/$tmp/ };

Or, in this particular case, something almost as ugly:

   my $days_re = do { local $" = '|'; qr/@days/ };

Still, it seems that /e might be entirely useful on qr//.  Anyone have
examples or counter-examples that come to mind?

t.
~sdpm~

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