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regexp character classes and +

Mark Volkmann
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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)


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


R. Mark Volkmann
Partner, Object Computing, Inc.

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