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/usr/share/gtksourceview-2.0/language-specs/forth.lang is in libgtksourceview2.0-common 2.10.5-3.

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The actual contents of the file can be viewed below.

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<?xml version="1.0" encoding="UTF-8"?>
<!--

 Author: Jens-Hanno Schwalm  <hanno@schwalm-bremen.de>
 Copyright (C) 2007 Jens-Hanno Schwalm; <hanno@schwalm-bremen.de>

 This library is free software; you can redistribute it and/or
 modify it under the terms of the GNU Library General Public
 License as published by the Free Software Foundation; either
 version 2 of the License, or (at your option) any later version.

 This library is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 Library General Public License for more details.

 You should have received a copy of the GNU Library General Public
 License along with this library; if not, write to the
 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 Boston, MA 02111-1307, USA.

-->
<language id="forth" _name="Forth" version="2.0" _section="Sources">
  <metadata>
    <property name="mimetypes">text/x-forth</property>
    <property name="globs">*.frt;*.fs</property>
    <property name="line-comment-start">\</property>
    <property name="block-comment-start">(*</property>
    <property name="block-comment-end">*)</property>
  </metadata>

  <styles>
    <style id="comment"       _name="Comment"            map-to="def:comment"/>
    <style id="string"        _name="String"             map-to="def:string"/>
    <style id="preprocessor"  _name="Preprocessor"       map-to="def:preprocessor"/>
    <style id="keyword"       _name="Keyword"            map-to="def:statement"/>
    <style id="type"          _name="Data Type"          map-to="def:type"/>
    <style id="number"        _name="Number"             map-to="def:decimal"/>
    <style id="debugs"        _name="Debug Code"         map-to="def:comment"/>
    <style id="error"         _name="Error Text"         map-to="def:error"/>
    <style id="compiler"      _name="Compiler Directive" map-to="def:identifier"/>
  </styles>

  <default-regex-options case-sensitive="false"/>

  <definitions>
    <context id="forth" class="no-spell-check">
      <include>
        <!--        single line comments                        \        \G        -->
        <context id="comment" style-ref="comment" end-at-line-end="true" class="comment" class-disabled="no-spell-check">
          <start>(?&lt;![^\s])(\\|--|\\G)(?![^\s])</start>
          <include>
            <context ref="def:in-line-comment"/>
          </include>
        </context>

        <!--        multiline comments ending with ")"        (        (S        (F        -->
        <context id="comment-multiline" style-ref="comment" class="comment" class-disabled="no-spell-check">
          <start>(?&lt;![^\s])(\(|\(S|\(F)(?![^\s])</start>
          <end>\)</end>
          <include>
            <context ref="def:in-comment"/>
          </include>
        </context>

        <!--        multiline comment (* ....*)        -->
        <context id="comment-multiline2" style-ref="comment" class="comment" class-disabled="no-spell-check">
          <start>(?&lt;![^\s])\(\*(?![^\s])</start>
          <end>\*\)(?![^\s])</end>
          <include>
            <context ref="def:in-comment"/>
          </include>
        </context>

        <!--        multiline comment DOC ... ENDDOC        -->
        <context id="comment-multiline3" style-ref="comment" class="comment" class-disabled="no-spell-check">
          <start>(?&lt;![^\s])DOC(?![^\s])</start>
          <end>(?&lt;![^\s])ENDDOC(?![^\s])</end>
          <include>
            <context ref="def:in-comment"/>
          </include>
        </context>

        <!--        preprocessor instructions followed by a string        -->
        <context id="preproc1" style-ref="preprocessor">
          <match extended="true">
            (?&lt;![^\s])
            (NEEDS|INCLUDE|IN|MARKER)\s+[^\s]*
            (?![^\s])
          </match>
        </context>

        <!--        REVISION instruction is followed by a filename plus a string between "..."        -->
        <context id="preproc2" style-ref="preprocessor">
          <match extended="true">
            (?&lt;![^\s])
            (REVISION)\s+[^\s]*\s*".*"
            (?![^\s])
          </match>
        </context>

        <!--        preprocessor instructions        -->
        <context id="preproc3" style-ref="preprocessor">
          <match extended="true">
            (?&lt;![^\s])
            (INCLUDED|INCLUDE-FILE)
            (?![^\s])
          </match>
        </context>

        <!--        all defining or compiler extension words are followed by another whitespace delinited word        -->
        <context id="definers" style-ref="type">
          <match extended="true">
            (?&lt;![^\s])
            (POSTPONE|\[COMPILE\]|\[CHAR\]|\['\]|COMPILE|CHAR|[DFT]?VALUE|[2FT]?VARIABLE|[DS]?FVARIABLE|[T]?USER|[T]?CODE|[DZFT]?LOCAL|
            [2FT]?CONSTANT|TCONSTANT-|TSUB|=\:|==\:|DEFER|HC\:|[VHTM]?\:)\s+[^\s]+
            (?![^\s])
          </match>
        </context>

        <!--        the grouped local words like LOCALS| read words until a last |        -->
        <context id="locals" style-ref="type">
          <match extended="true">
            (?&lt;![^\s])
            ([DFZ]?LOCALS)\|\s+[^\|]+[\|]
            (?![^\s])
          </match>
        </context>

        <!--        strings ended by a "                S"        ."        EVAL"        C"        Z"        -->
        <context id="string" style-ref="string" end-at-line-end="true" class="string" class-disabled="no-spell-check">
          <start>(?&lt;![^\s])(S|[.]|EVAL|C|Z|,)"\s</start>
          <end>"</end>
         </context>

        <!--        strings ended by a ~ character when " is inside a string:        .~        -->
        <context id="string2" style-ref="string" end-at-line-end="true" class="string" class-disabled="no-spell-check">
          <start>(?&lt;![^\s])(.~)\s</start>
          <end>~</end>
         </context>

        <!--        comment string  .( ..)        -->
        <context id="string3" style-ref="string" end-at-line-end="true" class="string" class-disabled="no-spell-check">
          <start>(?&lt;![^\s])[.]\(\s</start>
          <end>\)</end>
         </context>

        <!--        error strings ending with "                ABORT"        ?ERROR"        -->
        <context id="errorstring" style-ref="error" end-at-line-end="true" class="string" class-disabled="no-spell-check">
          <start>(?&lt;![^\s])(ABORT|\?ERROR)"\s</start>
          <end>"</end>
         </context>

        <!--        represent numbers including the hex, decimal and binary prefixes, also short characters        -->
        <context id="number" style-ref="number">
          <match extended="true">
            (?&lt;![^\s])
            ([$][-+]?[A-F0-9.]+ |
             [#][-+]?[0-9.]+ |
             [%][-+]?[0-1.]+ |
             [-+]?[0-9.]+ |
             [-+]?[0-9]+[.]?[0-9]*[eE][0-9]* |
             '[^\s]' |
             [\^][A-Za-z] |
             TRUE |
             FALSE)
            (?![^\s])
          </match>
        </context>

        <!--        Control flow Keywords -->
        <context id="keywords" style-ref="keyword">
          <match extended="true">
            (?&lt;![^\s])
            (\[IF\]|\[ELSE\]|\[THEN\]|\[DEFINED\]|\[UNDEFINED\]|\?DEF|\?UNDEF|THROW|CASE|ENDCASE|OF|ENDOF|FOR|NEXT|
                    IF[,]?|ELSE[,]?|THEN[,]?|ENDIF[,]?|BEGIN[,]?|WHILE[,]?|REPEAT[,]?|UNTIL[,]?|AGAIN[,]?|DO|LOOP|\?DO|\+LOOP|LEAVE|\?LEAVE|UNLOOP|EXIT|\?EXIT|
                    PAR|ENDPAR|STARTP|ENDP)
            (?![^\s])
          </match>
        </context>

        <!--        Compiler modifications -->
        <context id="keywords2" style-ref="compiler">
          <match extended="true">
            (?&lt;![^\s])
            (PRIVATE|PRIVATES|DEPRIVE|FORGET|IMMEDIATE|ALSO|ONLY|FORTH|DEFINITIONS|HEADERLESS)
            (?![^\s])
          </match>
        </context>

        <!--        Defining keywords without displaying the following word        -->
        <context id="keywords3" style-ref="type">
          <match extended="true">
            (?&lt;![^\s])
            (\:ABOUT|DOES>|FORGET>|CREATE|\:NONAME)
            (?![^\s])
          </match>
        </context>

        <!--        <<DEBUG        ..... DEBUG>> -->
        <context id="comment-debug" extend-parent="false" style-ref="debugs">
          <start>(?&lt;![^\s])(&lt;&lt;DEBUG)(?![^\s])</start>
          <end>(?&lt;![^\s])(DEBUG>>)(?![^\s])</end>
          <include>
            <context ref="keywords"/>
            <context ref="keywords2"/>
            <context ref="keywords3"/>
            <context ref="number"/>
            <context ref="comment"/>
            <context ref="string" />
            <context ref="string2" />
            <context ref="string3" />
            <context ref="errorstring" />
            <context ref="locals" />
            <context ref="definers" />
            <context ref="comment-multiline"/>
          </include>
        </context>

        <!--        [ ... ] is displayed as a preprocessor structure        -->
        <context id="preproc4" extend-parent="true" style-ref="preprocessor">
          <start>(?&lt;![^\s])(\[)(?![^\s])</start>
          <end>(?&lt;![^\s])(\])(?![^\s])</end>
          <include>
            <context ref="keywords"/>
            <context ref="number"/>
            <context ref="comment"/>
            <context ref="comment-multiline"/>
          </include>
        </context>
      </include>
    </context>
  </definitions>
</language>