Document what the backtick returns if the command fails.

[p5sagit/p5-mst-13.2.git] / pod / perlre.pod

diff --git a/pod/perlre.pod b/pod/perlre.pod
index a82ab32..c964be8 100644 (file)
--- a/pod/perlre.pod
+++ b/pod/perlre.pod
@@ -216,7 +216,7 @@ character class.  For example:
 
     [01[:alpha:]%]
 
-matches one, zero, any alphabetic character, and the percentage sign.
+matches zero, one, any alphabetic character, and the percentage sign.
 
 If the C<utf8> pragma is used, the following equivalences to Unicode
 \p{} constructs hold:
@@ -250,23 +250,24 @@ The assumedly non-obviously named classes are:
 Any control character.  Usually characters that don't produce output as
 such but instead control the terminal somehow: for example newline and
 backspace are control characters.  All characters with ord() less than
-32 are most often classified as control characters.
+32 are most often classified as control characters (assuming ASCII,
+the ISO Latin character sets, and Unicode).
 
 =item graph
 
-Any alphanumeric or punctuation character.
+Any alphanumeric or punctuation (special) character.
 
 =item print
 
-Any alphanumeric or punctuation character or space.
+Any alphanumeric or punctuation (special) character or space.
 
 =item punct
 
-Any punctuation character.
+Any punctuation (special) character.
 
 =item xdigit
 
-Any hexadecimal digit.  Though this may feel silly (/0-9a-f/i would
+Any hexadecimal digit.  Though this may feel silly ([0-9A-Fa-f] would
 work just fine) it is included for completeness.
 
 =back
@@ -381,6 +382,7 @@ use for a pattern. Simply quote all non-"word" characters:
 
     $pattern =~ s/(\W)/\\$1/g;
 
+(If C<use locale> is set, then this depends on the current locale.)
 Today it is more common to use the quotemeta() function or the C<\Q>
 metaquoting escape sequence to disable all metacharacters' special
 meanings like this: