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On page 71 of Pickaxe 2, discussing character classes, it says "The
significance of special regular expression characters (including +) is
turned off inside the brackets."

Why is this a valid regular expression (+ not the first character in
the character class)

%r{^[-+*/]$}

but this isn't? (+ is the first character in the character class)

%r{^[+-*/]$}

--=20
R. Mark Volkmann
Partner, Object Computing, Inc.