diff --git a/runtime/syntax/ruby.vim b/runtime/syntax/ruby.vim
index e3aee12..28f553d 100644
--- a/runtime/syntax/ruby.vim
+++ b/runtime/syntax/ruby.vim
@@ -1,9 +1,7 @@
 " Vim syntax file
 " Language:		Ruby
 " Maintainer:		Doug Kearns <dougkearns@gmail.com>
-" Last Change:		2009 Dec 2
-" URL:			http://vim-ruby.rubyforge.org
-" Anon CVS:		See above site
+" URL:			https://github.com/vim-ruby/vim-ruby
 " Release Coordinator:	Doug Kearns <dougkearns@gmail.com>
 " ----------------------------------------------------------------------------
 "
@@ -32,8 +30,8 @@
 
 " Operators
 if exists("ruby_operators")
-  syn match  rubyOperator	 "\%([~!^&|*/%+-]\|\%(class\s*\)\@<!<<\|<=>\|<=\|\%(<\|\<class\s\+\u\w*\s*\)\@<!<[^<]\@=\|===\|==\|=\~\|>>\|>=\|=\@<!>\|\*\*\|\.\.\.\|\.\.\|::\)"
-  syn match  rubyPseudoOperator  "\%(-=\|/=\|\*\*=\|\*=\|&&=\|&=\|&&\|||=\||=\|||\|%=\|+=\|!\~\|!=\)"
+  syn match  rubyOperator "[~!^&|*/%+-]\|\%(class\s*\)\@<!<<\|<=>\|<=\|\%(<\|\<class\s\+\u\w*\s*\)\@<!<[^<]\@=\|===\|==\|=\~\|>>\|>=\|=\@<!>\|\*\*\|\.\.\.\|\.\.\|::"
+  syn match  rubyOperator "->\|-=\|/=\|\*\*=\|\*=\|&&=\|&=\|&&\|||=\||=\|||\|%=\|+=\|!\~\|!="
   syn region rubyBracketOperator matchgroup=rubyOperator start="\%(\w[?!]\=\|[]})]\)\@<=\[\s*" end="\s*]" contains=ALLBUT,@rubyNotTop
 endif
 
@@ -95,86 +93,89 @@
 syn match rubyBlockArgument	    "&[_[:lower:]][_[:alnum:]]"		 contains=NONE display transparent
 
 syn match  rubyConstant		"\%(\%([.@$]\@<!\.\)\@<!\<\|::\)\_s*\zs\u\w*\%(\>\|::\)\@=\%(\s*(\)\@!"
-syn match  rubyClassVariable	"@@\h\w*" display
-syn match  rubyInstanceVariable "@\h\w*"  display
-syn match  rubyGlobalVariable	"$\%(\h\w*\|-.\)"
-syn match  rubySymbol		"[]})\"':]\@<!:\%(\^\|\~\|<<\|<=>\|<=\|<\|===\|==\|=\~\|>>\|>=\|>\||\|-@\|-\|/\|\[]=\|\[]\|\*\*\|\*\|&\|%\|+@\|+\|`\)"
+syn match  rubyClassVariable	"@@\%(\h\|[^\x00-\x7F]\)\%(\w\|[^\x00-\x7F]\)*" display
+syn match  rubyInstanceVariable "@\%(\h\|[^\x00-\x7F]\)\%(\w\|[^\x00-\x7F]\)*"  display
+syn match  rubyGlobalVariable	"$\%(\%(\h\|[^\x00-\x7F]\)\%(\w\|[^\x00-\x7F]\)*\|-.\)"
+syn match  rubySymbol		"[]})\"':]\@<!:\%(\^\|\~\|<<\|<=>\|<=\|<\|===\|[=!]=\|[=!]\~\|!\|>>\|>=\|>\||\|-@\|-\|/\|\[]=\|\[]\|\*\*\|\*\|&\|%\|+@\|+\|`\)"
 syn match  rubySymbol		"[]})\"':]\@<!:\$\%(-.\|[`~<=>_,;:!?/.'"@$*\&+0]\)"
-syn match  rubySymbol		"[]})\"':]\@<!:\%(\$\|@@\=\)\=\h\w*"
-syn match  rubySymbol		"[]})\"':]\@<!:\h\w*\%([?!=]>\@!\)\="
+syn match  rubySymbol		"[]})\"':]\@<!:\%(\$\|@@\=\)\=\%(\h\|[^\x00-\x7F]\)\%(\w\|[^\x00-\x7F]\)*"
+syn match  rubySymbol		"[]})\"':]\@<!:\%(\h\|[^\x00-\x7F]\)\%(\w\|[^\x00-\x7F]\)*\%([?!=]>\@!\)\="
 syn match  rubySymbol		"\%([{(,]\_s*\)\@<=\l\w*[!?]\=::\@!"he=e-1
-syn match  rubySymbol		"[]})\"':]\@<!\h\w*[!?]\=:\s\@="he=e-1
+syn match  rubySymbol		"[]})\"':]\@<!\%(\h\|[^\x00-\x7F]\)\%(\w\|[^\x00-\x7F]\)*[!?]\=:\s\@="he=e-1
+syn match  rubySymbol		"\%([{(,]\_s*\)\@<=[[:space:],{]\l\w*[!?]\=::\@!"hs=s+1,he=e-1
+syn match  rubySymbol		"[[:space:],{]\%(\h\|[^\x00-\x7F]\)\%(\w\|[^\x00-\x7F]\)*[!?]\=:\s\@="hs=s+1,he=e-1
 syn region rubySymbol		start="[]})\"':]\@<!:'"  end="'"  skip="\\\\\|\\'"  contains=rubyQuoteEscape fold
 syn region rubySymbol		start="[]})\"':]\@<!:\"" end="\"" skip="\\\\\|\\\"" contains=@rubyStringSpecial fold
 
-syn match  rubyBlockParameter	  "\h\w*" contained
+syn match  rubyBlockParameter	  "\%(\h\|[^\x00-\x7F]\)\%(\w\|[^\x00-\x7F]\)*" contained
 syn region rubyBlockParameterList start="\%(\%(\<do\>\|{\)\s*\)\@<=|" end="|" oneline display contains=rubyBlockParameter
 
 syn match rubyInvalidVariable	 "$[^ A-Za-z_-]"
-syn match rubyPredefinedVariable #$[!$&"'*+,./0:;<=>?@\`~1-9]#
+syn match rubyPredefinedVariable #$[!$&"'*+,./0:;<=>?@\`~]#
+syn match rubyPredefinedVariable "$\d\+"										   display
 syn match rubyPredefinedVariable "$_\>"											   display
 syn match rubyPredefinedVariable "$-[0FIKadilpvw]\>"									   display
 syn match rubyPredefinedVariable "$\%(deferr\|defout\|stderr\|stdin\|stdout\)\>"					   display
 syn match rubyPredefinedVariable "$\%(DEBUG\|FILENAME\|KCODE\|LOADED_FEATURES\|LOAD_PATH\|PROGRAM_NAME\|SAFE\|VERBOSE\)\>" display
 syn match rubyPredefinedConstant "\%(\%(\.\@<!\.\)\@<!\|::\)\_s*\zs\%(MatchingData\|ARGF\|ARGV\|ENV\)\>\%(\s*(\)\@!"
-syn match rubyPredefinedConstant "\%(\%(\.\@<!\.\)\@<!\|::\)\_s*\zs\%(DATA\|FALSE\|NIL\|RUBY_PLATFORM\|RUBY_RELEASE_DATE\)\>\%(\s*(\)\@!"
-syn match rubyPredefinedConstant "\%(\%(\.\@<!\.\)\@<!\|::\)\_s*\zs\%(RUBY_VERSION\|STDERR\|STDIN\|STDOUT\|TOPLEVEL_BINDING\|TRUE\)\>\%(\s*(\)\@!"
-"Obsolete Global Constants
-"syn match rubyPredefinedConstant "\%(::\)\=\zs\%(PLATFORM\|RELEASE_DATE\|VERSION\)\>"
-"syn match rubyPredefinedConstant "\%(::\)\=\zs\%(NotImplementError\)\>"
+syn match rubyPredefinedConstant "\%(\%(\.\@<!\.\)\@<!\|::\)\_s*\zs\%(DATA\|FALSE\|NIL\)\>\%(\s*(\)\@!"
+syn match rubyPredefinedConstant "\%(\%(\.\@<!\.\)\@<!\|::\)\_s*\zs\%(STDERR\|STDIN\|STDOUT\|TOPLEVEL_BINDING\|TRUE\)\>\%(\s*(\)\@!"
+syn match rubyPredefinedConstant "\%(\%(\.\@<!\.\)\@<!\|::\)\_s*\zs\%(RUBY_\%(VERSION\|RELEASE_DATE\|PLATFORM\|PATCHLEVEL\|REVISION\|DESCRIPTION\|COPYRIGHT\|ENGINE\)\)\>\%(\s*(\)\@!"
 
 " Normal Regular Expression
-syn region rubyRegexp matchgroup=rubyRegexpDelimiter start="\%(\%(^\|\<\%(and\|or\|while\|until\|unless\|if\|elsif\|when\|not\|then\|else\)\|[;\~=!|&(,[>]\)\s*\)\@<=/" end="/[iomxneus]*" skip="\\\\\|\\/" contains=@rubyRegexpSpecial keepend fold
+syn region rubyRegexp matchgroup=rubyRegexpDelimiter start="\%(\%(^\|\<\%(and\|or\|while\|until\|unless\|if\|elsif\|when\|not\|then\|else\)\|[;\~=!|&(,[<>?:*+-]\)\s*\)\@<=/" end="/[iomxneus]*" skip="\\\\\|\\/" contains=@rubyRegexpSpecial fold
 syn region rubyRegexp matchgroup=rubyRegexpDelimiter start="\%(\h\k*\s\+\)\@<=/[ \t=]\@!" end="/[iomxneus]*" skip="\\\\\|\\/" contains=@rubyRegexpSpecial fold
 
 " Generalized Regular Expression
-syn region rubyRegexp matchgroup=rubyRegexpDelimiter start="%r\z([~`!@#$%^&*_\-+=|\:;"',.?/]\)"	end="\z1[iomxneus]*" skip="\\\\\|\\\z1" contains=@rubyRegexpSpecial fold
-syn region rubyRegexp matchgroup=rubyRegexpDelimiter start="%r{"				end="}[iomxneus]*"   skip="\\\\\|\\}"	contains=@rubyRegexpSpecial fold
-syn region rubyRegexp matchgroup=rubyRegexpDelimiter start="%r<"				end=">[iomxneus]*"   skip="\\\\\|\\>"	contains=@rubyRegexpSpecial,rubyNestedAngleBrackets,rubyDelimEscape fold
-syn region rubyRegexp matchgroup=rubyRegexpDelimiter start="%r\["				end="\][iomxneus]*"  skip="\\\\\|\\\]"	contains=@rubyRegexpSpecial fold
-syn region rubyRegexp matchgroup=rubyRegexpDelimiter start="%r("				end=")[iomxneus]*"   skip="\\\\\|\\)"	contains=@rubyRegexpSpecial fold
+syn region rubyRegexp matchgroup=rubyRegexpDelimiter start="%r\z([~`!@#$%^&*_\-+=|\:;"',.? /]\)" end="\z1[iomxneus]*" skip="\\\\\|\\\z1" contains=@rubyRegexpSpecial fold
+syn region rubyRegexp matchgroup=rubyRegexpDelimiter start="%r{"				 end="}[iomxneus]*"   skip="\\\\\|\\}"	 contains=@rubyRegexpSpecial fold
+syn region rubyRegexp matchgroup=rubyRegexpDelimiter start="%r<"				 end=">[iomxneus]*"   skip="\\\\\|\\>"	 contains=@rubyRegexpSpecial,rubyNestedAngleBrackets,rubyDelimEscape fold
+syn region rubyRegexp matchgroup=rubyRegexpDelimiter start="%r\["				 end="\][iomxneus]*"  skip="\\\\\|\\\]"	 contains=@rubyRegexpSpecial fold
+syn region rubyRegexp matchgroup=rubyRegexpDelimiter start="%r("				 end=")[iomxneus]*"   skip="\\\\\|\\)"	 contains=@rubyRegexpSpecial fold
 
 " Normal String and Shell Command Output
-syn region rubyString matchgroup=rubyStringDelimiter start="\"" end="\"" skip="\\\\\|\\\"" contains=@rubyStringSpecial fold
-syn region rubyString matchgroup=rubyStringDelimiter start="'"	end="'"  skip="\\\\\|\\'"  contains=rubyQuoteEscape    fold
+syn region rubyString matchgroup=rubyStringDelimiter start="\"" end="\"" skip="\\\\\|\\\"" contains=@rubyStringSpecial,@Spell fold
+syn region rubyString matchgroup=rubyStringDelimiter start="'"	end="'"  skip="\\\\\|\\'"  contains=rubyQuoteEscape,@Spell    fold
 syn region rubyString matchgroup=rubyStringDelimiter start="`"	end="`"  skip="\\\\\|\\`"  contains=@rubyStringSpecial fold
 
 " Generalized Single Quoted String, Symbol and Array of Strings
-syn region rubyString matchgroup=rubyStringDelimiter start="%[qw]\z([~`!@#$%^&*_\-+=|\:;"',.?/]\)" end="\z1" skip="\\\\\|\\\z1" fold
-syn region rubyString matchgroup=rubyStringDelimiter start="%[qw]{"				   end="}"   skip="\\\\\|\\}"	fold contains=rubyNestedCurlyBraces,rubyDelimEscape
-syn region rubyString matchgroup=rubyStringDelimiter start="%[qw]<"				   end=">"   skip="\\\\\|\\>"	fold contains=rubyNestedAngleBrackets,rubyDelimEscape
-syn region rubyString matchgroup=rubyStringDelimiter start="%[qw]\["				   end="\]"  skip="\\\\\|\\\]"	fold contains=rubyNestedSquareBrackets,rubyDelimEscape
-syn region rubyString matchgroup=rubyStringDelimiter start="%[qw]("				   end=")"   skip="\\\\\|\\)"	fold contains=rubyNestedParentheses,rubyDelimEscape
-syn region rubySymbol matchgroup=rubySymbolDelimiter start="%[s]\z([~`!@#$%^&*_\-+=|\:;"',.?/]\)"  end="\z1" skip="\\\\\|\\\z1" fold
-syn region rubySymbol matchgroup=rubySymbolDelimiter start="%[s]{"				   end="}"   skip="\\\\\|\\}"	fold contains=rubyNestedCurlyBraces,rubyDelimEscape
-syn region rubySymbol matchgroup=rubySymbolDelimiter start="%[s]<"				   end=">"   skip="\\\\\|\\>"	fold contains=rubyNestedAngleBrackets,rubyDelimEscape
-syn region rubySymbol matchgroup=rubySymbolDelimiter start="%[s]\["				   end="\]"  skip="\\\\\|\\\]"	fold contains=rubyNestedSquareBrackets,rubyDelimEscape
-syn region rubySymbol matchgroup=rubySymbolDelimiter start="%[s]("				   end=")"   skip="\\\\\|\\)"	fold contains=rubyNestedParentheses,rubyDelimEscape
+syn region rubyString matchgroup=rubyStringDelimiter start="%[qwi]\z([~`!@#$%^&*_\-+=|\:;"',.?/]\)" end="\z1" skip="\\\\\|\\\z1" fold
+syn region rubyString matchgroup=rubyStringDelimiter start="%[qwi]{"				   end="}"   skip="\\\\\|\\}"	fold contains=rubyNestedCurlyBraces,rubyDelimEscape
+syn region rubyString matchgroup=rubyStringDelimiter start="%[qwi]<"				   end=">"   skip="\\\\\|\\>"	fold contains=rubyNestedAngleBrackets,rubyDelimEscape
+syn region rubyString matchgroup=rubyStringDelimiter start="%[qwi]\["				   end="\]"  skip="\\\\\|\\\]"	fold contains=rubyNestedSquareBrackets,rubyDelimEscape
+syn region rubyString matchgroup=rubyStringDelimiter start="%[qwi]("				   end=")"   skip="\\\\\|\\)"	fold contains=rubyNestedParentheses,rubyDelimEscape
+syn region rubyString matchgroup=rubyStringDelimiter start="%q "				   end=" "   skip="\\\\\|\\)"	fold
+syn region rubySymbol matchgroup=rubySymbolDelimiter start="%s\z([~`!@#$%^&*_\-+=|\:;"',.? /]\)"   end="\z1" skip="\\\\\|\\\z1" fold
+syn region rubySymbol matchgroup=rubySymbolDelimiter start="%s{"				   end="}"   skip="\\\\\|\\}"	fold contains=rubyNestedCurlyBraces,rubyDelimEscape
+syn region rubySymbol matchgroup=rubySymbolDelimiter start="%s<"				   end=">"   skip="\\\\\|\\>"	fold contains=rubyNestedAngleBrackets,rubyDelimEscape
+syn region rubySymbol matchgroup=rubySymbolDelimiter start="%s\["				   end="\]"  skip="\\\\\|\\\]"	fold contains=rubyNestedSquareBrackets,rubyDelimEscape
+syn region rubySymbol matchgroup=rubySymbolDelimiter start="%s("				   end=")"   skip="\\\\\|\\)"	fold contains=rubyNestedParentheses,rubyDelimEscape
 
 " Generalized Double Quoted String and Array of Strings and Shell Command Output
 " Note: %= is not matched here as the beginning of a double quoted string
 syn region rubyString matchgroup=rubyStringDelimiter start="%\z([~`!@#$%^&*_\-+|\:;"',.?/]\)"	    end="\z1" skip="\\\\\|\\\z1" contains=@rubyStringSpecial fold
-syn region rubyString matchgroup=rubyStringDelimiter start="%[QWx]\z([~`!@#$%^&*_\-+=|\:;"',.?/]\)" end="\z1" skip="\\\\\|\\\z1" contains=@rubyStringSpecial fold
-syn region rubyString matchgroup=rubyStringDelimiter start="%[QWx]\={"				    end="}"   skip="\\\\\|\\}"	 contains=@rubyStringSpecial,rubyNestedCurlyBraces,rubyDelimEscape    fold
-syn region rubyString matchgroup=rubyStringDelimiter start="%[QWx]\=<"				    end=">"   skip="\\\\\|\\>"	 contains=@rubyStringSpecial,rubyNestedAngleBrackets,rubyDelimEscape  fold
-syn region rubyString matchgroup=rubyStringDelimiter start="%[QWx]\=\["				    end="\]"  skip="\\\\\|\\\]"	 contains=@rubyStringSpecial,rubyNestedSquareBrackets,rubyDelimEscape fold
-syn region rubyString matchgroup=rubyStringDelimiter start="%[QWx]\=("				    end=")"   skip="\\\\\|\\)"	 contains=@rubyStringSpecial,rubyNestedParentheses,rubyDelimEscape    fold
+syn region rubyString matchgroup=rubyStringDelimiter start="%[QWIx]\z([~`!@#$%^&*_\-+=|\:;"',.?/]\)" end="\z1" skip="\\\\\|\\\z1" contains=@rubyStringSpecial fold
+syn region rubyString matchgroup=rubyStringDelimiter start="%[QWIx]\={"				    end="}"   skip="\\\\\|\\}"	 contains=@rubyStringSpecial,rubyNestedCurlyBraces,rubyDelimEscape    fold
+syn region rubyString matchgroup=rubyStringDelimiter start="%[QWIx]\=<"				    end=">"   skip="\\\\\|\\>"	 contains=@rubyStringSpecial,rubyNestedAngleBrackets,rubyDelimEscape  fold
+syn region rubyString matchgroup=rubyStringDelimiter start="%[QWIx]\=\["				    end="\]"  skip="\\\\\|\\\]"	 contains=@rubyStringSpecial,rubyNestedSquareBrackets,rubyDelimEscape fold
+syn region rubyString matchgroup=rubyStringDelimiter start="%[QWIx]\=("				    end=")"   skip="\\\\\|\\)"	 contains=@rubyStringSpecial,rubyNestedParentheses,rubyDelimEscape    fold
+syn region rubyString matchgroup=rubyStringDelimiter start="%[Qx] "				    end=" "   skip="\\\\\|\\)"   contains=@rubyStringSpecial fold
 
 " Here Document
-syn region rubyHeredocStart matchgroup=rubyStringDelimiter start=+\%(\%(class\s*\|\%([]})"'.]\|::\)\)\_s*\|\w\)\@<!<<-\=\zs\%(\h\w*\)+	 end=+$+ oneline contains=ALLBUT,@rubyNotTop
+syn region rubyHeredocStart matchgroup=rubyStringDelimiter start=+\%(\%(class\s*\|\%([]})"'.]\|::\)\)\_s*\|\w\)\@<!<<-\=\zs\%(\%(\h\|[^\x00-\x7F]\)\%(\w\|[^\x00-\x7F]\)*\)+	 end=+$+ oneline contains=ALLBUT,@rubyNotTop
 syn region rubyHeredocStart matchgroup=rubyStringDelimiter start=+\%(\%(class\s*\|\%([]})"'.]\|::\)\)\_s*\|\w\)\@<!<<-\=\zs"\%([^"]*\)"+ end=+$+ oneline contains=ALLBUT,@rubyNotTop
 syn region rubyHeredocStart matchgroup=rubyStringDelimiter start=+\%(\%(class\s*\|\%([]})"'.]\|::\)\)\_s*\|\w\)\@<!<<-\=\zs'\%([^']*\)'+ end=+$+ oneline contains=ALLBUT,@rubyNotTop
 syn region rubyHeredocStart matchgroup=rubyStringDelimiter start=+\%(\%(class\s*\|\%([]})"'.]\|::\)\)\_s*\|\w\)\@<!<<-\=\zs`\%([^`]*\)`+ end=+$+ oneline contains=ALLBUT,@rubyNotTop
 
-syn region rubyString start=+\%(\%(class\s*\|\%([]})"'.]\|::\)\)\_s*\|\w\)\@<!<<\z(\h\w*\)\ze+hs=s+2	matchgroup=rubyStringDelimiter end=+^\z1$+ contains=rubyHeredocStart,@rubyStringSpecial fold keepend
-syn region rubyString start=+\%(\%(class\s*\|\%([]})"'.]\|::\)\)\_s*\|\w\)\@<!<<"\z([^"]*\)"\ze+hs=s+2	matchgroup=rubyStringDelimiter end=+^\z1$+ contains=rubyHeredocStart,@rubyStringSpecial fold keepend
-syn region rubyString start=+\%(\%(class\s*\|\%([]})"'.]\|::\)\)\_s*\|\w\)\@<!<<'\z([^']*\)'\ze+hs=s+2	matchgroup=rubyStringDelimiter end=+^\z1$+ contains=rubyHeredocStart			fold keepend
-syn region rubyString start=+\%(\%(class\s*\|\%([]})"'.]\|::\)\)\_s*\|\w\)\@<!<<`\z([^`]*\)`\ze+hs=s+2	matchgroup=rubyStringDelimiter end=+^\z1$+ contains=rubyHeredocStart,@rubyStringSpecial fold keepend
+syn region rubyString start=+\%(\%(class\|::\)\_s*\|\%([]})"'.]\)\s\|\w\)\@<!<<\z(\%(\h\|[^\x00-\x7F]\)\%(\w\|[^\x00-\x7F]\)*\)\ze\%(.*<<-\=['`"]\=\h\)\@!+hs=s+2	matchgroup=rubyStringDelimiter end=+^\z1$+ contains=rubyHeredocStart,rubyHeredoc,@rubyStringSpecial fold keepend
+syn region rubyString start=+\%(\%(class\|::\)\_s*\|\%([]})"'.]\)\s\|\w\)\@<!<<"\z([^"]*\)"\ze\%(.*<<-\=['`"]\=\h\)\@!+hs=s+2	matchgroup=rubyStringDelimiter end=+^\z1$+ contains=rubyHeredocStart,rubyHeredoc,@rubyStringSpecial fold keepend
+syn region rubyString start=+\%(\%(class\|::\)\_s*\|\%([]})"'.]\)\s\|\w\)\@<!<<'\z([^']*\)'\ze\%(.*<<-\=['`"]\=\h\)\@!+hs=s+2	matchgroup=rubyStringDelimiter end=+^\z1$+ contains=rubyHeredocStart,rubyHeredoc			fold keepend
+syn region rubyString start=+\%(\%(class\|::\)\_s*\|\%([]})"'.]\)\s\|\w\)\@<!<<`\z([^`]*\)`\ze\%(.*<<-\=['`"]\=\h\)\@!+hs=s+2	matchgroup=rubyStringDelimiter end=+^\z1$+ contains=rubyHeredocStart,rubyHeredoc,@rubyStringSpecial fold keepend
 
-syn region rubyString start=+\%(\%(class\s*\|\%([]}).]\|::\)\)\_s*\|\w\)\@<!<<-\z(\h\w*\)\ze+hs=s+3    matchgroup=rubyStringDelimiter end=+^\s*\zs\z1$+ contains=rubyHeredocStart,@rubyStringSpecial fold keepend
-syn region rubyString start=+\%(\%(class\s*\|\%([]}).]\|::\)\)\_s*\|\w\)\@<!<<-"\z([^"]*\)"\ze+hs=s+3  matchgroup=rubyStringDelimiter end=+^\s*\zs\z1$+ contains=rubyHeredocStart,@rubyStringSpecial fold keepend
-syn region rubyString start=+\%(\%(class\s*\|\%([]}).]\|::\)\)\_s*\|\w\)\@<!<<-'\z([^']*\)'\ze+hs=s+3  matchgroup=rubyStringDelimiter end=+^\s*\zs\z1$+ contains=rubyHeredocStart		     fold keepend
-syn region rubyString start=+\%(\%(class\s*\|\%([]}).]\|::\)\)\_s*\|\w\)\@<!<<-`\z([^`]*\)`\ze+hs=s+3  matchgroup=rubyStringDelimiter end=+^\s*\zs\z1$+ contains=rubyHeredocStart,@rubyStringSpecial fold keepend
+syn region rubyString start=+\%(\%(class\|::\)\_s*\|\%([]}).]\)\s\|\w\)\@<!<<-\z(\%(\h\|[^\x00-\x7F]\)\%(\w\|[^\x00-\x7F]\)*\)\ze\%(.*<<-\=['`"]\=\h\)\@!+hs=s+3    matchgroup=rubyStringDelimiter end=+^\s*\zs\z1$+ contains=rubyHeredocStart,@rubyStringSpecial fold keepend
+syn region rubyString start=+\%(\%(class\|::\)\_s*\|\%([]}).]\)\s\|\w\)\@<!<<-"\z([^"]*\)"\ze\%(.*<<-\=['`"]\=\h\)\@!+hs=s+3  matchgroup=rubyStringDelimiter end=+^\s*\zs\z1$+ contains=rubyHeredocStart,@rubyStringSpecial fold keepend
+syn region rubyString start=+\%(\%(class\|::\)\_s*\|\%([]}).]\)\s\|\w\)\@<!<<-'\z([^']*\)'\ze\%(.*<<-\=['`"]\=\h\)\@!+hs=s+3  matchgroup=rubyStringDelimiter end=+^\s*\zs\z1$+ contains=rubyHeredocStart		     fold keepend
+syn region rubyString start=+\%(\%(class\|::\)\_s*\|\%([]}).]\)\s\|\w\)\@<!<<-`\z([^`]*\)`\ze\%(.*<<-\=['`"]\=\h\)\@!+hs=s+3  matchgroup=rubyStringDelimiter end=+^\s*\zs\z1$+ contains=rubyHeredocStart,@rubyStringSpecial fold keepend
 
 if exists('main_syntax') && main_syntax == 'eruby'
   let b:ruby_no_expensive = 1
@@ -187,7 +188,7 @@
 syn match  rubyModuleDeclaration   "[^[:space:];#<]\+"	 contained contains=rubyConstant,rubyOperator
 syn match  rubyFunction "\<[_[:alpha:]][_[:alnum:]]*[?!=]\=[[:alnum:]_.:?!=]\@!" contained containedin=rubyMethodDeclaration
 syn match  rubyFunction "\%(\s\|^\)\@<=[_[:alpha:]][_[:alnum:]]*[?!=]\=\%(\s\|$\)\@=" contained containedin=rubyAliasDeclaration,rubyAliasDeclaration2
-syn match  rubyFunction "\%([[:space:].]\|^\)\@<=\%(\[\]=\=\|\*\*\|[+-]@\=\|[*/%|&^~]\|<<\|>>\|[<>]=\=\|<=>\|===\|==\|=\~\|`\)\%([[:space:];#(]\|$\)\@=" contained containedin=rubyAliasDeclaration,rubyAliasDeclaration2,rubyMethodDeclaration
+syn match  rubyFunction "\%([[:space:].]\|^\)\@<=\%(\[\]=\=\|\*\*\|[+-]@\=\|[*/%|&^~]\|<<\|>>\|[<>]=\=\|<=>\|===\|[=!]=\|[=!]\~\|!\|`\)\%([[:space:];#(]\|$\)\@=" contained containedin=rubyAliasDeclaration,rubyAliasDeclaration2,rubyMethodDeclaration
 
 syn cluster rubyDeclaration contains=rubyAliasDeclaration,rubyAliasDeclaration2,rubyMethodDeclaration,rubyModuleDeclaration,rubyClassDeclaration,rubyFunction,rubyBlockParameter
 
@@ -198,7 +199,7 @@
 syn match   rubyOperator       "\<defined?" display
 syn match   rubyKeyword	       "\<\%(super\|yield\)\>[?!]\@!"
 syn match   rubyBoolean	       "\<\%(true\|false\)\>[?!]\@!"
-syn match   rubyPseudoVariable "\<\%(nil\|self\|__FILE__\|__LINE__\)\>[?!]\@!"
+syn match   rubyPseudoVariable "\<\%(nil\|self\|__ENCODING__\|__FILE__\|__LINE__\|__callee__\|__method__\)\>[?!]\@!" " TODO: reorganise
 syn match   rubyBeginEnd       "\<\%(BEGIN\|END\)\>[?!]\@!"
 
 " Expensive Mode - match 'end' with the appropriate opening keyword for syntax
@@ -220,13 +221,13 @@
 
   syn region rubyDoBlock      matchgroup=rubyControl start="\<do\>" end="\<end\>"                 contains=ALLBUT,@rubyNotTop fold
   " curly bracket block or hash literal
-  syn region rubyCurlyBlock   start="{" end="}"							  contains=ALLBUT,@rubyNotTop fold
-  syn region rubyArrayLiteral matchgroup=rubyArrayDelimiter start="\%(\w\|[\]})]\)\@<!\[" end="]" contains=ALLBUT,@rubyNotTop fold
+  syn region rubyCurlyBlock	matchgroup=rubyCurlyBlockDelimiter  start="{" end="}"				contains=ALLBUT,@rubyNotTop fold
+  syn region rubyArrayLiteral	matchgroup=rubyArrayDelimiter	    start="\%(\w\|[\]})]\)\@<!\[" end="]"	contains=ALLBUT,@rubyNotTop fold
 
   " statements without 'do'
   syn region rubyBlockExpression       matchgroup=rubyControl	  start="\<begin\>" end="\<end\>" contains=ALLBUT,@rubyNotTop fold
   syn region rubyCaseExpression	       matchgroup=rubyConditional start="\<case\>"  end="\<end\>" contains=ALLBUT,@rubyNotTop fold
-  syn region rubyConditionalExpression matchgroup=rubyConditional start="\%(\%(^\|\.\.\.\=\|[{:,;([<>~\*/%&^|+=-]\|\%(\<[_[:lower:]][_[:alnum:]]*\)\@<![?!]\)\s*\)\@<=\%(if\|unless\)\>" end="\<end\>" contains=ALLBUT,@rubyNotTop fold
+  syn region rubyConditionalExpression matchgroup=rubyConditional start="\%(\%(^\|\.\.\.\=\|[{:,;([<>~\*/%&^|+=-]\|\%(\<[_[:lower:]][_[:alnum:]]*\)\@<![?!]\)\s*\)\@<=\%(if\|unless\)\>" end="\%(\%(\%(\.\@<!\.\)\|::\)\s*\)\@<!\<end\>" contains=ALLBUT,@rubyNotTop fold
 
   syn match rubyConditional "\<\%(then\|else\|when\)\>[?!]\@!"	contained containedin=rubyCaseExpression
   syn match rubyConditional "\<\%(then\|else\|elsif\)\>[?!]\@!" contained containedin=rubyConditionalExpression
@@ -239,7 +240,7 @@
   syn region rubyRepeatExpression start="\<for\>[?!]\@!" start="\%(\%(^\|\.\.\.\=\|[{:,;([<>~\*/%&^|+-]\|\%(\<[_[:lower:]][_[:alnum:]]*\)\@<![!=?]\)\s*\)\@<=\<\%(until\|while\)\>" matchgroup=rubyRepeat end="\<end\>" contains=ALLBUT,@rubyNotTop nextgroup=rubyOptionalDoLine fold
 
   if !exists("ruby_minlines")
-    let ruby_minlines = 50
+    let ruby_minlines = 500
   endif
   exec "syn sync minlines=" . ruby_minlines
 
@@ -253,7 +254,7 @@
 
 " Special Methods
 if !exists("ruby_no_special_methods")
-  syn keyword rubyAccess    public protected private module_function
+  syn keyword rubyAccess    public protected private public_class_method private_class_method public_constant private_constant module_function
   " attr is a common variable name
   syn match   rubyAttribute "\%(\%(^\|;\)\s*\)\@<=attr\>\(\s*[.=]\)\@!"
   syn keyword rubyAttribute attr_accessor attr_reader attr_writer
@@ -262,17 +263,17 @@
   syn keyword rubyException raise fail catch throw
   " false positive with 'include?'
   syn match   rubyInclude   "\<include\>[?!]\@!"
-  syn keyword rubyInclude   autoload extend load require
+  syn keyword rubyInclude   autoload extend load prepend require require_relative
   syn keyword rubyKeyword   callcc caller lambda proc
 endif
 
 " Comments and Documentation
 syn match   rubySharpBang "\%^#!.*" display
-syn keyword rubyTodo	  FIXME NOTE TODO OPTIMIZE XXX contained
+syn keyword rubyTodo	  FIXME NOTE TODO OPTIMIZE XXX todo contained
 syn match   rubyComment   "#.*" contains=rubySharpBang,rubySpaceError,rubyTodo,@Spell
 if !exists("ruby_no_comment_fold")
   syn region rubyMultilineComment start="\%(\%(^\s*#.*\n\)\@<!\%(^\s*#.*\n\)\)\%(\(^\s*#.*\n\)\{1,}\)\@=" end="\%(^\s*#.*\n\)\@<=\%(^\s*#.*\n\)\%(^\s*#\)\@!" contains=rubyComment transparent fold keepend
-  syn region rubyDocumentation	  start="^=begin\ze\%(\s.*\)\=$" end="^=end\s*$" contains=rubySpaceError,rubyTodo,@Spell fold
+  syn region rubyDocumentation	  start="^=begin\ze\%(\s.*\)\=$" end="^=end\%(\s.*\)\=$" contains=rubySpaceError,rubyTodo,@Spell fold
 else
   syn region rubyDocumentation	  start="^=begin\s*$" end="^=end\s*$" contains=rubySpaceError,rubyTodo,@Spell
 endif
@@ -286,12 +287,12 @@
 syn match rubyKeywordAsMethod "\<\%(alias\|begin\|case\|class\|def\|do\|end\)[?!]" transparent contains=NONE
 syn match rubyKeywordAsMethod "\<\%(if\|module\|undef\|unless\|until\|while\)[?!]" transparent contains=NONE
 
-syn match rubyKeywordAsMethod "\%(\%(\.\@<!\.\)\|::\)\_s*\%(abort\|at_exit\|attr\|attr_accessor\|attr_reader\)\>"   transparent contains=NONE
-syn match rubyKeywordAsMethod "\%(\%(\.\@<!\.\)\|::\)\_s*\%(attr_writer\|autoload\|callcc\|catch\|caller\)\>"	    transparent contains=NONE
-syn match rubyKeywordAsMethod "\%(\%(\.\@<!\.\)\|::\)\_s*\%(eval\|class_eval\|instance_eval\|module_eval\|exit\)\>" transparent contains=NONE
-syn match rubyKeywordAsMethod "\%(\%(\.\@<!\.\)\|::\)\_s*\%(extend\|fail\|fork\|include\|lambda\)\>"		    transparent contains=NONE
-syn match rubyKeywordAsMethod "\%(\%(\.\@<!\.\)\|::\)\_s*\%(load\|loop\|private\|proc\|protected\)\>"		    transparent contains=NONE
-syn match rubyKeywordAsMethod "\%(\%(\.\@<!\.\)\|::\)\_s*\%(public\|require\|raise\|throw\|trap\)\>"		    transparent contains=NONE
+syn match rubyKeywordAsMethod "\%(\%(\.\@<!\.\)\|::\)\_s*\%(abort\|at_exit\|attr\|attr_accessor\|attr_reader\)\>"	transparent contains=NONE
+syn match rubyKeywordAsMethod "\%(\%(\.\@<!\.\)\|::\)\_s*\%(attr_writer\|autoload\|callcc\|catch\|caller\)\>"		transparent contains=NONE
+syn match rubyKeywordAsMethod "\%(\%(\.\@<!\.\)\|::\)\_s*\%(eval\|class_eval\|instance_eval\|module_eval\|exit\)\>"	transparent contains=NONE
+syn match rubyKeywordAsMethod "\%(\%(\.\@<!\.\)\|::\)\_s*\%(extend\|fail\|fork\|include\|lambda\)\>"			transparent contains=NONE
+syn match rubyKeywordAsMethod "\%(\%(\.\@<!\.\)\|::\)\_s*\%(load\|loop\|prepend\|private\|proc\|protected\)\>"		transparent contains=NONE
+syn match rubyKeywordAsMethod "\%(\%(\.\@<!\.\)\|::\)\_s*\%(public\|require\|require_relative\|raise\|throw\|trap\)\>"	transparent contains=NONE
 
 " __END__ Directive
 syn region rubyData matchgroup=rubyDataDirective start="^__END__$" end="\%$" fold
@@ -330,7 +331,6 @@
 hi def link rubySymbol			Constant
 hi def link rubyKeyword			Keyword
 hi def link rubyOperator		Operator
-hi def link rubyPseudoOperator		rubyOperator
 hi def link rubyBeginEnd		Statement
 hi def link rubyAccess			Statement
 hi def link rubyAttribute		Statement
@@ -351,6 +351,7 @@
 hi def link rubyRegexpDelimiter		rubyStringDelimiter
 hi def link rubySymbolDelimiter		rubyStringDelimiter
 hi def link rubyStringDelimiter		Delimiter
+hi def link rubyHeredoc			rubyString
 hi def link rubyString			String
 hi def link rubyRegexpEscape		rubyRegexpSpecial
 hi def link rubyRegexpQuantifier	rubyRegexpSpecial