perldelta for 959f7ad7 (local *Detached::method)

[perl5.git] / pod / perlreref.pod

diff --git a/pod/perlreref.pod b/pod/perlreref.pod
index 11da56d..83c1316 100644 (file)
--- a/pod/perlreref.pod
+++ b/pod/perlreref.pod
@@ -107,6 +107,7 @@ These work as in normal strings.
    \u  Titlecase next character
    \L  Lowercase until \E
    \U  Uppercase until \E
+   \F  Foldcase until \E
    \Q  Disable pattern metacharacters until \E
    \E  End modification
 
@@ -274,13 +275,15 @@ There is no quantifier C<{,n}>. That's interpreted as a literal string.
    ${^MATCH}      Entire matched string
    ${^POSTMATCH}  Everything after to matched string
 
+Note to those still using Perl 5.16 or earlier:
 The use of C<$`>, C<$&> or C<$'> will slow down B<all> regex use
-within your program. Consult L<perlvar> for C<@->
-to see equivalent expressions that won't cause slow down.
-See also L<Devel::SawAmpersand>. Starting with Perl 5.10, you
+within your program.  Consult L<perlvar> for C<@->
+to see equivalent expressions that won't cause slowdown.
+See also L<Devel::SawAmpersand>.  Starting with Perl 5.10, you
 can also use the equivalent variables C<${^PREMATCH}>, C<${^MATCH}>
 and C<${^POSTMATCH}>, but for them to be defined, you have to
 specify the C</p> (preserve) modifier on your regular expression.
+In Perl 5.18, the use of C<$`>, C<$&> and C<$'> makes no speed difference.
 
    $1, $2 ...  hold the Xth captured expr
    $+    Last parenthesized pattern match
@@ -299,6 +302,7 @@ Captured groups are numbered according to their I<opening> paren.
    lcfirst     Lowercase first char of a string
    uc          Uppercase a string
    ucfirst     Titlecase first char of a string
+   fc          Foldcase a string
 
    pos         Return or set current match position
    quotemeta   Quote metacharacters
@@ -307,8 +311,9 @@ Captured groups are numbered according to their I<opening> paren.
 
    split       Use a regex to split a string into parts
 
-The first four of these are like the escape sequences C<\L>, C<\l>,
-C<\U>, and C<\u>.  For Titlecase, see L</Titlecase>.
+The first five of these are like the escape sequences C<\L>, C<\l>,
+C<\U>, C<\u>, and C<\F>.  For Titlecase, see L</Titlecase>; For
+Foldcase, see L</Foldcase>.
 
 =head2 TERMINOLOGY
 
@@ -317,6 +322,12 @@ C<\U>, and C<\u>.  For Titlecase, see L</Titlecase>.
 Unicode concept which most often is equal to uppercase, but for
 certain characters like the German "sharp s" there is a difference.
 
+=head3 Foldcase
+
+Unicode form that is useful when comparing strings regardless of case,
+as certain characters have compex one-to-many case mappings. Primarily a
+variant of lowercase.
+
 =head1 AUTHOR
 
 Iain Truskett. Updated by the Perl 5 Porters.