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| -rw-r--r-- | pod/perlrebackslash.pod | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/pod/perlrebackslash.pod b/pod/perlrebackslash.pod index d8cfb6ade2..ac95ace136 100644 --- a/pod/perlrebackslash.pod +++ b/pod/perlrebackslash.pod @@ -500,7 +500,9 @@ C<< (?>\x0D\x0A)|\v) >>. Since C<\R> can match a more than one character, it cannot be put inside a bracketed character class; C</[\R]/> is an error. C<\R> is introduced in perl 5.10. -Mnemonic: none really. C<\R> was picked because PCRE already uses C<\R>. +Mnemonic: none really. C<\R> was picked because PCRE already uses C<\R>, +and more importantly because Unicode recommends such a regular expression +metacharacter, and suggests C<\R> as the notation. =item \X @@ -512,6 +514,11 @@ mark character followed by zero or more mark characters. Mark characters include (but are not restricted to) I<combining characters> and I<vowel signs>. +C<\X> matches quite well what normal (non-Unicode-programmer) usage +would consider a single character: for example a base character +(the C<\PM> above), for example a letter, followed by zero or more +diacritics, which are I<combining characters> (the C<\pM*> above). + Mnemonic: eI<X>tended Unicode character. =back |