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/usr/share/highlight/langDefs/msl.lang is in highlight-common 3.41-1.

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Description="mIRC Scripting"
--msl, nbs

Keywords={
{  Id=1,
   List={"if", "while", "else", "for", "inc", "dec" }
  },
  {  Id=2,
   List={"set", "var", "alias", "on", "msg", "kick",       
		"ajinvite","amsg","anick","autojoin","background","ban","beep","channel","clear","clearall",
		"clipboard","close","color","copy","creq","ctcreply","debug","describe","disconnect","dll","dns",
		"dqwindow","ebeeps","editbox","emailaddr","exit","filter","flash","flushini","font","fullname",
		"help","hop","join","linesep","links","load","loadbuf","localinfo","log","mdi","mkdir",
		"mnick","nick","noop","omsg","partall","pdcc","perform","play","pop","pvoice","qmsg","query",
		"queryrn","raw","remini","remove","rename","resetidle","rmdir","run","save","savebuf","saveini",
		"say","server","showmirc","sline","speak","splay","sreq","strip","timer","timestamp","titlebar",
		"titlebar","tnick","tokenize","unload","updatenl","url","winhelp","write","writeini" }
  },
  { Id=2,
    Regex=[[ /\w+ ]],
  },
  { Id=3,
    Regex=[[ \$[\w\d\+\$]+ ]],
  },
  { Id=4,
    Regex=[[ [&%]\w+ ]],
  }
}

Strings = {
  Delimiter=[["|']]
}

Comments = {
   { Block=true,
     Nested=false,
     Delimiter = { [[\/\*]], [[\*\/]] }
   },
   {
     Block=false,
     Delimiter = { [[;]] }
   }
}

Operators=[[\(|\)|\[|\]|\{|\}|\,|\;|\.|\:|\&|<|>|\!|=|\/|\*|\%|\+|\-|\~|\||\^]]