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Monday August 09, 2004
09:12 AM

What you see is not what you get (WYSINWYG)

[ #20317 ]

Here's a curious result I ran across while working on a test suite.

$ perl -le 'print "All digits!" if 0x20 =~ /^\d+\z/'
All digits!

Of course, the literal representation of that value in the program text is not the same as what Perl actually uses after it stringifies it.

$ perl -le 'print 0x20'

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  • $ perl -le 'print "No underscores!" if 1_234_567_890 !~ /_/'
    • $ perl -le 'print "No e!" if 1e6 !~ /e/'
      $ perl -le 'print "There's an e!" if 6666666666666666 =~ /e/'
      $ perl -le 'print "There's a plus!" if 1e15 =~ /\+/'
      $ perl -le 'print "No dot!" if 0.00 !~ /\./'