three18ti has asked for the wisdom of the Perl Monks concerning the following question:

Hello Monks

I'm looking at the Marpa docs, and the example for a "hash comment char" definition is:

<hash comment char> ~ [^\x{A}\x{B}\x{C}\x{D}\x{2028}\x{2029}]

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What character classes are \x{A} \x{B} \x{C} \x{D}, and more importantly, where can I look them up? I'm fairly certain that \x{2028} is a newline and \x{2029} is a paragraph separator (not sure how that's different than a new line...) class.

Thanks!

Edit: You all rock! Thanks for the help!

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Re: What are these hex character classes?
by Kenosis (Priest) on Dec 08, 2013 at 00:37 UTC
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      This is great. Thank you!

      So like most things in computing, the zeros are omitted, so \x{A} is actually \x{000A}.

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        You're most welcome, three18ti!

        Perl expectedly parses both as "\n" (the leading zeros aren't significant):

        perl -MO=Deparse,-p -e 'print "\x{A}"'

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        Output:

        print("\n");
-e syntax OK

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        And:

        use warnings;
use strict;

print ord "\x{A}" if "\x{000A}" eq "\n";

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        Output:

        10

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        As you see, \x{A}, \x{000A} and \n all represent the same character.

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Re: What are these hex character classes? (perlrebackslash)
by Anonymous Monk on Dec 08, 2013 at 00:55 UTC
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