Author: pmichaud Date: 2009-03-09 20:50:03 +0100 (Mon, 09 Mar 2009) New Revision: 25767
Modified: docs/Perl6/Spec/S05-regex.pod Log: [spec]: Update S05: remove <word>, add <ww>, revise <wb>, <ws>, <space>, and <blank>. Modified: docs/Perl6/Spec/S05-regex.pod =================================================================== --- docs/Perl6/Spec/S05-regex.pod 2009-03-09 17:33:17 UTC (rev 25766) +++ docs/Perl6/Spec/S05-regex.pod 2009-03-09 19:50:03 UTC (rev 25767) @@ -1619,9 +1619,9 @@ =back -=head2 Predefined Metasyntax +=head2 Predefined Subrules -The following symbols are predefined entries in the metasyntax. +These are the predefined subrules for any grammar or regex: =over @@ -1669,25 +1669,31 @@ Match a single alphanumeric character. This is equivalent to <+alpha +digit> . -= item * word +=item * wb -Match a single word character, viz., alphanumeric plus '_'. +Returns a zero-width match that is true at word boundaries. A word +boundary is a spot with a "\w" on one side and a "\W" on the other +side (in either order), counting the beginning and end of the string +as matching "\W". -=item * wb +=item * ww -Returns true if we're at a word boundary. A word boundary is a spot between two characters, one which matches <word>, the other matches <-word>, counting the imaginary characters off the beginning and end of the string as matching a <-word>. +Matches between two word characters (zero-width match). =item * ws -Match whitespace between tokens. +Matches required whitespace between two word characters, optional +whitespace otherwise. This is roughly equivalent to C<< <!ww> \s* >> +(C<ws> isn't required to use the C<ww> subrule). =item * space -Match a single whitespace character. Hence C< <ws> > is equivalent to C< <space>+ >. +Match a single whitespace character (same as C< \s > ). =item * blank -Match a single "blank" character. Differs from C< <space> > which include C<tab>'s etc. +Match a single "blank" character -- in most locales, this corresponds +to space and tab. =item * before C<pattern>
