* CP1251: contributed by Byte
+New feature of version 6.7.0
+--------------------------
+
+* NEW: hexadecimal codepoint \uHHHH
+* NEW: add ONIG_SYNTAX_ONIGURUMA (== ONIG_SYNTAX_DEFAULT)
+* Disabled \N and \O on ONIG_SYNTAX_RUBY
+* Reduced object size
+
+
+New feature of version 6.6.1
+--------------------------
+
+* Fix definition of \X
+
+
New feature of version 6.6.0
--------------------------
-* NEW: ASCII mode options for char type/property (?WDSP)
-* SPEC: Absent-clear operator restores previous range in backtrack.
+* NEW: ASCII only mode options for character type/property (?WDSP)
+* NEW: Extended Grapheme Cluster boundary \y, \Y (*original)
+* NEW: Extended Grapheme Cluster \X
+* Range-clear (Absent-clear) operator restores previous range in backtrack.
New feature of version 6.5.0
* NEW: Backreference validity checker (?(xxx)) (*original)
* NEW: Absent repeater (?~absent)
* NEW: Absent expression (?~|absent|expr) (*original)
-* NEW: Absent range cutter (?~|absent) (*original)
+* NEW: Absent stopper (?~|absent) (*original)
New feature of version 6.4.0
--------------------------
* Fix fatal problem of endless repeat on Windows
-* NEW: call zero (call the total regexp)
-* NEW: relative backref and relative call by positive number
+* NEW: call zero (call the total regexp) \g<0>
+* NEW: relative backref/call by positive number \k<+n>, \g<+n>
New feature of version 6.3.0
--------------------------
-* NEW SYNTAX: escape-o-brace for octal codepoint.
+* NEW: octal codepoint \o{.....}
New feature of version 6.1.2