Once again syncing after too long an absence

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

diff --git a/pod/perlre.pod b/pod/perlre.pod
index 380bc5f..c5ecb13 100644 (file)
--- a/pod/perlre.pod
+++ b/pod/perlre.pod
@@ -225,19 +225,21 @@ whole character class.  For example:
 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:
+\p{} constructs and equivalent backslash character classes (if available),
+will hold:
 
     alpha       IsAlpha
     alnum       IsAlnum
     ascii       IsASCII
     blank      IsSpace
     cntrl       IsCntrl
-    digit       IsDigit
+    digit       IsDigit        \d
     graph       IsGraph
     lower       IsLower
     print       IsPrint
     punct       IsPunct
     space       IsSpace
+                IsSpacePerl    \s
     upper       IsUpper
     word        IsWord
     xdigit      IsXDigit
@@ -910,10 +912,14 @@ ways they can use backtracking to try match.  For example, without
 internal optimizations done by the regular expression engine, this will
 take a painfully long time to run:
 
-    'aaaaaaaaaaaa' =~ /((a{0,5}){0,5}){0,5}[c]/
+    'aaaaaaaaaaaa' =~ /((a{0,5}){0,5})*[c]/
 
-And if you used C<*>'s instead of limiting it to 0 through 5 matches,
-then it would take forever--or until you ran out of stack space.
+And if you used C<*>'s in the internal groups instead of limiting them
+to 0 through 5 matches, then it would take forever--or until you ran
+out of stack space.  Moreover, these internal optimizations are not
+always applicable.  For example, if you put C<{0,5}> instead of C<*>
+on the external group, no current optimization is applicable, and the
+match takes a long time to finish.
 
 A powerful tool for optimizing such beasts is what is known as an
 "independent group",
@@ -1129,7 +1135,7 @@ one match at a given position is possible.  This section describes the
 notion of better/worse for combining operators.  In the description
 below C<S> and C<T> are regular subexpressions.
 
-=over
+=over 4
 
 =item C<ST>