[DOC] Fix doc/regexp.rdoc links

- Rename regexp.rdoc to exclude from "Pages".  This file is for to be
  included in the "class Regexp" document, but it also appeared as a
  separate page duplicately.
- Fix links on case-sensitive filesystems.
- Fix to use rdoc-ref instead of converted HTML page names.

1 files changed, 2 insertions, 2 deletions

diff --git a/dir.rb b/dir.rb
index 7de62da921..632c49eee9 100644
--- a/dir.rb
+++ b/dir.rb
@@ -320,7 +320,7 @@ class Dir
   #     Dir.glob('io.?') # => ["io.c"]
   #
   # - <tt>'[_set_]'</tt>: Matches any one character in the string _set_;
-  #   behaves like a {Regexp character class}[rdoc-ref:regexp.rdoc@Character+Classes],
+  #   behaves like a {Regexp character class}[rdoc-ref:Regexp@Character+Classes],
   #   including set negation (<tt>'[^a-z]'</tt>):
   #
   #     Dir.glob('*.[a-z][a-z]').take(3)
@@ -328,7 +328,7 @@ class Dir
   #
   # - <tt>'{_abc_,_xyz_}'</tt>:
   #   Matches either string _abc_ or string _xyz_;
-  #   behaves like {Regexp alternation}[rdoc-ref:regexp.rdoc@Alternation]:
+  #   behaves like {Regexp alternation}[rdoc-ref:Regexp@Alternation]:
   #
   #     Dir.glob('{LEGAL,BSDL}') # => ["LEGAL", "BSDL"]
   #