Nano syntax highlighting

• Save asterisk.nanorc e.g. in /usr/local/share/nano/asterisk.nanorc
• Add include "/usr/local/share/nano/asterisk.nanorc" to either /etc/nanorc or ~/.nanorc

asterisk.nanorc

My current suggestion

I have modified some colors to make it all visible on my light background, added colour for technology and made it highlight contexts. The keyword regex could be optimized, I will work on that part.
Updated 2007-11-18, optimized (hopefully) the application regex, added some other stuff.
Updated 2011-07-17, changing colour for priority "1" to blue. (Csabka)
Updated 2014-10-1, enabled syntax highlighting files named extensions.conf. (imcdona)

## Asterisk syntax highlighting
## v.03 2007-11-18
## Comments/updates - jmcanfield@gmail.com

## Modified by Johan Adler from 2007-11-17 and forward, tested using Debian and Asterisk 1.2.13
## 2007-11-18
## Currently optimized for dialplan (extensions.conf and any included files)
## Application regex altered and hopefully optimized.
## Note that the order of regex's is important
## color is case sensitive, icolor case insensitive

syntax "asterisk" "/.*/asterisk/.*\.conf$|extensions.conf"
## Separating characters
color	green	"(\{|\}|\(|\)|\]|\[|`|\\|\$|<|>|!|=|&|\|)"

## Labels
color   blue   "^(\s)*exten(\s)*=>(\s)*((s|t|a|i|o|fax)|[0-9*#]+|_([XZN0-9*#]*(\[[XZN0-9*#]*\])*[XZN0-9*#]*)*(\.)?),([0-9]|n)\([A-Za-z0-9_\-]+\)"

## Priorities
color   green   "^(\s)*exten(\s)*=>(\s)*((s|t|a|i|o|fax)|[0-9*#]+|_([XZN0-9*#]*(\[[XZN0-9*#]*\])*[XZN0-9*#]*)*(\.)?),([02-9]|n)"
color   blue    "^(\s)*exten(\s)*=>(\s)*((s|t|a|i|o|fax)|[0-9*#]+|_([XZN0-9*#]*(\[[XZN0-9*#]*\])*[XZN0-9*#]*)*(\.)?),(1)"

## Comma back to black
color	black	"^(\s)*exten(\s)*=>(\s)*((s|t|a|i|o|fax)|[0-9*#]+|_([XZN0-9*#]*(\[[XZN0-9*#]*\])*[XZN0-9*#]*)*(\.)?),"
## Extensions
color	red	"^(\s)*exten(\s)*=>(\s)*((s|t|a|i|o|fax)|[0-9*#]+|_([XZN0-9*#]*(\[[XZN0-9*#]*\])*[XZN0-9*#]*)*(\.)?)"
## Word 'exten' in dialplan
color	magenta	"^(\s)*exten(\s)*=>"

## included context
color	green	"^(\s)*include(\s)*=>(\s)*\<.+\>"
## 'include' in dialplan
color	magenta	"^(\s)*include(\s)*=>"

## Conditionals
color	blue	"\$\[.+\]"
## Contexts
color	green 	"^\[.+\]"
## Strings
color	magenta	""(\\.|[^"])*"" "'(\\.|[^'])*'"
## Technologies
color	magenta	"\<(SIP/|IAX2/|Zap/|Local/).*\>"
## Anything following NoOp, same color as comments (will not be executed)
## Colored before variables, since they will be substituted
color	yellow	"\<NoOp\>. ...