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+README  2003/07/04
+
+Oniguruma  ----   (C) K.Kosako <kosako@sofnec.co.jp>
+
+http://www.ruby-lang.org/cgi-bin/cvsweb.cgi/oniguruma/
+
+Oniguruma is a regular expression library.
+The characteristics of this library is that different character encodings
+for every regular expression object can be specified.
+(Supported character encodings: ASCII, UTF-8, EUC-JP, Shift_JIS)
+
+There are two ways of using of it in this program.
+
+  * Built-in regular expression engine of Ruby
+  * C library (supported APIs: GNU regex, POSIX, Oniguruma native)
+
+
+Install
+
+A. Install into Ruby
+
+   See INSTALL-RUBY.
+
+
+B. C library
+
+ B1. Unix, Cygwin
+
+   1. ./configure
+   2. make
+   3. make install
+
+   (* uninstall:  make uninstall)
+
+  * test (EUC-JP)
+   4. make ctest
+
+
+ B2. Win32 platform (VC++)
+
+   1. copy win32\config.h config.h
+   2. copy win32\Makefile Makefile
+   3. nmake
+
+        onig_s.lib:  static link library
+        onig.dll:    dynamic link library
+
+  * test (Shift_JIS)
+   4. copy win32\testc.c testc.c
+   5. nmake ctest
+
+
+
+License
+
+   When this software is partly used or it is distributed with Ruby, 
+   this of Ruby follows the license of Ruby.
+   It follows the BSD license in the case of the one except for it.
+
+
+Source Files
+
+  oniguruma.h    Oniguruma and GNU regex API header file
+  regint.h       internal definitions
+  regparse.h     internal definitions for regparse.c and regcomp.c
+  regparse.c     parsing functions.
+  regcomp.c      compiling and optimization functions
+  regerror.c     error message function
+  regex.c        source files wrapper for Ruby
+  regexec.c      search and match functions
+  reggnu.c       GNU regex API functions
+
+  onigposix.h    POSIX API header file
+  regposerr.c    POSIX API error message function (regerror)
+  regposix.c     POSIX API functions
+
+  sample/simple.c    example of the minimum (native API)
+  sample/posix.c     POSIX API sample.
+  sample/names.c     example of the named group callback.
+
+
+Regular expression
+
+  See doc/RE.
+
+
+API differences with Japanized GNU regex(version 0.12) of Ruby
+
+   + re_compile_fastmap() is removed.
+   + re_recompile_pattern() is added.
+   + re_alloc_pattern() is added.
+
+
+ToDo
+
+  1 support 16-bit and 31-bit encodings. (UCS-2, UCS-4, UTF-16)
+    (each encoding has meta-character code table?)
+
+  2 if-then-else. (?(condition)then), (?(condition)then|else)
+
+  ? variable meta characters.
+  ? implement syntax behavior REG_SYN_CONTEXT_INDEP_ANCHORS.
+  ? pattern encoding different with target.
+    (ex. UCS-2 Big Endian and UCS-2 Little Endian)
+  ? better acess to hash table.
+    non null-terminated key version st_lookup().
+    (but it needs to modify st.[ch])
+  ? character set specific POSIX bracket extensions. ([:hiragana:])
+  ? grep-like tool 'onigrep'. (variable syntax option etc..)
+  ? check invalid wide char value in WC2MB, WC2MB_FIRST on Ruby M17N.
+  ? define THREAD_PASS in regint.h as rb_thread_pass().
+
+
+and I'm thankful to Akinori MUSHA.