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/usr/share/highlight/langDefs/bcpl.lang is in highlight-common 3.18-3.

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Description="BCPL"

Keywords={
  {  Id=1,
   List={"NUMBER", "NAME", "STRINGCONST", "TRUE", "FALSE", "VALOF", "LV", "RV",
"DIV", "REM", "PLUS", "MINUS", "EQ", "NE", "LS", "GR", "LE", "GE", "NOT",
"LSHIFT", "RSHIFT", "LOGAND", "LOGOR", "EQV", "NEQV", "COND", "COMMA", "AND",
"ASS", "GOTO", "RESULTIS", "COLON", "TEST", "FOR", "IF", "UNLESS", "WHILE",
"UNTIL", "REPEAT", "REPEATWHILE", "REPEATUNTIL", "BREAK", "RETURN", "FINISH",
"SWITCHON", "CASE", "DEFAULT", "LET", "MANIFEST", "GLOBAL", "BE", "SECTBRA",
"SECTKET", "RBRA", "RKET", "SBRA", "SKET", "SEMICOLON", "INTO", "TO", "DO",
"OR", "VEC", "STAR"
        }
  },

  { Id=4,
    Regex=[[(\w+)\s*\(]]
  }
}

Strings = {
  Delimiter=[["|']],
  RawPrefix="R",
}

Comments = {

   {
     Block=false,
     Delimiter = { [[//]] }
   }
}

IgnoreCase=false

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