syntaxes: remove some superfluous outer parentheses from regexes

Also, standardize some comments, condense a few regexes, add some
word-edge anchors, and remove some superfluous backslashes.

syntax/autoconf.nanorc

@@ -5,7 +5,7 @@ comment "#"
 
 # Keywords:
 color yellow "\<(if|test|then|elif|else|fi|for|in|do|done)\>"
-color yellow "(=|!=|&&|\|\|)"
+color yellow "=|!=|&&|\|\|"
 
 # Macros:
 color cyan "\<[[:upper:]_[:digit:]]+\>"

syntax/awk.nanorc

@@ -14,7 +14,7 @@ color red "\<(PROCINFO|RS|RT|RSTART|RLENGTH|SUBSEP|TEXTDOMAIN)\>"
 # Function declarations and special patterns.
 color brightgreen "\<(function|extension|BEGIN|END)\>"
 # Operators.
-color green "(\{|\}|\(|\)|\;|\]|\[|\\|<|>|!|=|&|\+|-|\*|%|/|\?:|\^|\|)"
+color green "\{|\}|\(|\)|\;|\[|\]|\\|<|>|!|=|&|\+|-|\*|%|/|\?:|\^|\|"
 # Flow control.
 color brightyellow "\<(for|if|while|do|else|in|delete|exit)\>"
 color brightyellow "\<(break|continue|return)\>"

syntax/changelog.nanorc

@@ -12,7 +12,7 @@ color yellow "<[^>]*@[^>]*>"
 # Command-line options.
 color cyan "[[:space:]]-[a-zA-Z\$]" "--[8a-z-]+"
 # Bug and patch numbers.
-color cyan "(BZ|bug|patch) #[0-9]+" "PR [[:alnum:]]+/[0-9]+"
+color cyan "(BZ|bug|patch)[ ]#[0-9]+" "PR [[:alnum:]]+/[0-9]+"
 # Probable constants, for variety.
 color brightred "\<[A-Z_][0-9A-Z_]+\>"
 # Key sequences.

syntax/extra/debian.nanorc

@@ -1,4 +1,4 @@
-## Here is an example for apt's sources.list.
+## Syntax highlighting for apt's sources.list.
 
 syntax sources.list "sources\.list(\.d/.*\.list)?(~|\.old|\.save)?$"
 comment "#"

syntax/extra/gentoo.nanorc

@@ -1,5 +1,5 @@
-## Here is an example for Gentoo ebuilds/eclasses,
-## and (further down) one for Portage control files.
+## Syntax highlighting for Gentoo ebuilds/eclasses,
+## and (further down) for Portage control files.
 
 syntax ebuild "\.e(build|class|blit)$"
 comment "#"

syntax/extra/haskell.nanorc

@@ -10,13 +10,13 @@ comment "--"
 color red "\<(as|case|of|class|data|default|deriving|do|forall|foreign|hiding|if|then|else|import|infix(l|r)?|instance|let|in|mdo|module|newtype|qualified|type|where)\>"
 
 # Various symbols
-color cyan "(\||@|!|:|_|~|=|\\|;|\(\)|,|\[|\]|\{|\})"
+color cyan "\||@|!|:|_|~|=|\\|;|\(\)|,|\[|\]|\{|\}"
 
 # Operators
-color magenta "(==|/=|&&|\|\||<|>|<=|>=)"
+color magenta "==|/=|&&|\|\||<|>|<=|>="
 
 # More symbols
-color cyan "(->|<-|=>)"
+color cyan "->|<-|=>"
 color magenta "\.|\$"
 
 # Data constructors

syntax/extra/povray.nanorc

@@ -8,7 +8,7 @@ color brightyellow "\<(sphere|cylinder|translate|matrix|rotate|scale)\>"
 color brightyellow "\<(orthographic|location|up|right|direction|clipped_by)\>"
 color brightyellow "\<(fog_type|fog_offset|fog_alt|rgb|distance|transform)\>"
 color brightred "\<(background|camera|fog|light_source|object|texture)\>"
-color green "(\{|\}|\(|\)|\;|\]|\[|`|\\|\$|<|>|!|=|&|\|)"
+color green "\{|\}|\(|\)|\;|\]|\[|`|\\|\$|<|>|!|=|&|\|"
 color brightmagenta "\<(union|group|subgroup)\>"
 
 # Comments.

syntax/groff.nanorc

@@ -8,17 +8,17 @@ color cyan "^\.(ds|nr) [^[:space:]]*"
 # Single-character escapes
 color brightmagenta "\\."
 # The argument of \f or \s in the same color
-color brightmagenta "\\f." "\\f\(.." "\\s(\+|\-)?[0-9]"
+color brightmagenta "\\f(.|\(..)" "\\s(\+|\-)?[0-9]"
 # Newlines
-color cyan "(\\|\\\\)n(.|\(..)"
-color cyan start="(\\|\\\\)n\[" end="]"
+color cyan "\\(\\)?n(.|\(..)"
+color cyan start="\\(\\)?n\[" end="]"
 # Requests
 color brightgreen "^\.[[:space:]]*[^[:space:]]*"
 # Comments
 color yellow "^\.\\".*"
 # Strings
-color green "(\\|\\\\)\*(.|\(..)"
-color green start="(\\|\\\\)\*\[" end="]"
+color green "\\(\\)?\*(.|\(..)"
+color green start="\\(\\)?\*\[" end="]"
 # Characters
 color brightred "\\\(.."
 color brightred start="\\\[" end="]"

syntax/json.nanorc

@@ -16,7 +16,7 @@ color green ":[[:space:]]*\"#[0-9abcdefABCDEF]+\""
 # Escapes.
 color green "\\\\" "\\\"" "\\[bfnrt]" "\\u[0-9abcdefABCDEF]{4})"
 # Special words.
-color green "(true|false|null)"
+color green "\<(true|false|null)\>"
 
 # Names (very unlikely to contain a quote).
 color brightblue "\"[^"]+\"[[:space:]]*:"

syntax/po.nanorc

@@ -8,8 +8,8 @@ color green "^#.*$"
 color yellow "Copyright|\(C\)"
 # Header fields.
 color brightred "^\"X-Bugs:.*\"$"
-color brightmagenta "\<(Project\-Id\-Version|Report\-Msgid\-Bugs\-To|Last\-Translator|Language(\-Team)?|X-Bugs|X-Generator|Plural\-Forms)\>"
-color cyan "\<(POT\-Creation\-Date|PO\-Revision\-Date|MIME\-Version|Content\-Type|Content\-Transfer\-Encoding)\>"
+color brightmagenta "\<(Project-Id-Version|Report-Msgid-Bugs-To|Last-Translator|Language(-Team)?|X-Bugs|X-Generator|Plural-Forms)\>"
+color cyan "\<(POT-Creation-Date|PO-Revision-Date|MIME-Version|Content-Type|Content-Transfer-Encoding)\>"
 # Encodings and numbers.
 color yellow "\<(UTF|ISO|Windows|Mac|IBM)-[0-9]+"
 color yellow "\<((pre|rc)?[0-9]+|[0-9]bit)\>"
@@ -24,6 +24,6 @@ color brightmagenta "%([1-9]\$)?[a-z]*"
 color yellow "\""
 color cyan "\\([abcefnrtv"\]|x[0-9abcdefABCDEF]{2}|[0-7]{3})"
 # Reminders.
-color brightwhite,yellow "(FIXME|TODO|XXX)"
+color brightwhite,yellow "\<(FIXME|TODO|XXX)\>"
 # Obsolete strings.
 color red "#~.*"

syntax/python.nanorc

@@ -34,7 +34,7 @@ color brightgreen    start="'''([^'),]|$)" end="(^|[^(\])'''"
 color brightgreen    start=""""([^"),]|$)" end="(^|[^(\])""""
 
 # Reminders.
-color brightwhite,yellow "(FIXME|TODO|XXX)"
+color brightwhite,yellow "\<(FIXME|TODO|XXX)\>"
 
 # Trailing whitespace.
 color ,green "[[:space:]]+$"

syntax/ruby.nanorc

@@ -34,4 +34,4 @@ color brightcyan "##[^{].*" "##$"
 # "Here" docs.
 color green start="<<-?'?EOT'?" end="^EOT"
 # Some common markers.
-color brightcyan "(XXX|TODO|FIXME|\?\?\?)"
+color brightcyan "XXX|TODO|FIXME|\?\?\?"

syntax/rust.nanorc

@@ -35,4 +35,4 @@ color blue start="/\*" end="\*/"
 color magenta start="#!\[" end="\]"
 
 # Some common markers
-color brightcyan "(XXX|TODO|FIXME|\?\?\?)"
+color brightcyan "XXX|TODO|FIXME|\?\?\?"

syntax/tcl.nanorc

@@ -12,8 +12,8 @@ color green "\<string (bytelength|compare|equal|first|index|is|last|length|map|m
 # Extended TclX [info commands]:
 color green "\<(alarm|auto_load_pkg|bsearch|catclose|catgets|catopen|ccollate|cconcat|cequal|chgrp|chmod|chown|chroot|cindex|clength|cmdtrace|commandloop|crange|csubstr|ctoken|ctype|dup|echo|execl|fcntl|flock|fork|fstat|ftruncate|funlock|host_info|id|infox|keyldel|keylget|keylkeys|keylset|kill|lassign|lcontain|lempty|lgets|link|lmatch|loadlibindex|loop|lvarcat|lvarpop|lvarpush|max|min|nice|pipe|profile|random|readdir|replicate|scancontext|scanfile|scanmatch|select|server_accept|server_create|signal|sleep|sync|system|tclx_findinit|tclx_fork|tclx_load_tndxs|tclx_sleep|tclx_system|tclx_wait|times|translit|try_eval|umask|wait)\>"
 # Syntax:
-color brightblue "proc[[:space:]]" "(\{|\})"
-color green "(\(|\)|\;|`|\\|\$|<|>|!|=|&|\|)"
+color brightblue "\<proc[[:space:]]|\{|\}"
+color green "\(|\)|\;|`|\\|\$|<|>|!|=|&|\|"
 color brightyellow ""(\\.|[^"])*"" "'(\\.|[^'])*'"
 color brightred "\$\{?[0-9A-Za-z_!@#$*?-]+\}?"
 # Trailing whitespace: