Gedit groff syntax highlight

groff.lang

<?xml version="1.0" encoding="UTF-8"?>
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<language id="groff" name="groff" version="2.0" _section="Markup">

  <metadata>
    <property name="mimetypes">test/plain</property>
    <property name="globs">*.tmac;*.mom;*.ms;*.me;*.mm;*.1;*.2;*.3;*.4;*.5;*.6;*.7;*.8</property>
  </metadata>
  
  <styles>
    <style id="comment" name="Comment" map-to="def:comment"/>
    <style id="escaped-character" name="Escaped Character" map-to="def:special-char"/>
    <style id="macro" name="Macro" map-to="def:function"/>
    <style id="request" name="Request" map-to="def:builtin"/>
    <style id="preprocessor" name="Preprocessor Macro" map-to="def:preprocessor"/>
  </styles>
  
  <definitions>
    <context id="groff">
      <include>

        <context id="comment-new" style-ref="comment" class="comment">
          <start>\\#</start>
          <end>$</end>
        </context>
        
        <context id="comment-old" style-ref="comment" class="comment">
          <start>\\"</start>
          <end>$</end>
        </context>
        
        <!-- Here starts the escape sequences mimicking the groff spec. -->
        <!-- If one wants to implement the entire spec, have fun: https://web.cecs.pdx.edu/~trent/gnu/groff/groff.html#SEC52 -->
        <context id="escape-bracket" style-ref="escaped-character" class="no-spell-check">
          <start>\\[[]</start>
          <end>[]]</end>
        </context>
        
        <context id="escape-bracket-parameter" style-ref="escaped-character" class="no-spell-check">
          <start>\\.[[]</start>
          <end>[]]</end>
        </context>
        
        <context id="escape-parenthesis" style-ref="escaped-character" class="no-spell-check">
          <match>\\[(]..</match>
        </context>
        
        <context id="escape-parenthesis-parameter" style-ref="escaped-character" class="no-spell-check">
          <match>\\.[(]..</match>
        </context>
        
        <context id="escape-simple-parameter" style-ref="escaped-character" class="no-spell-check">
          <match>\\..</match>
        </context>
        
        <context id="escape-simple" style-ref="escaped-character" class="no-spell-check">
          <match>\\.</match>
        </context>
        
        <!-- Highlight preprocessors -->
        <!-- Maybe add preprocessor syntax coloring. -->
        <!-- Many preprocessors are missing. -->
        <context id="eqn" style-ref="preprocessor" class="no-spell-check">
          <!-- Could be nice to add in line highlight with "delim" eqn command -->
          <start>^\.EQ(\s|$)</start>
          <end>^\.EN</end>
        </context>
        
        <context id="pic" style-ref="preprocessor" class="no-spell-check">
          <start>^\.PS(\s|$)</start>
          <end>^\.PE</end>
        </context>
        
        <context id="tbl" style-ref="preprocessor" class="no-spell-check">
          <start>^\.TS(\s|$)</start>
          <end>^\.TE</end>
        </context>
        
        <context id="chem" style-ref="preprocessor" class="no-spell-check">
          <start>^\.cstart(\s|$)</start>
          <end>^\.cend</end>
        </context>
        
        <context id="refer-opt" style-ref="preprocessor" class="no-spell-check">
          <start>^\.R1(\s|$)</start>
          <end>^\.R2</end>
        </context>
        
        <context id="refer-cite" style-ref="preprocessor">
          <start>^\.[[]</start>
          <end>^\.[]]</end>
        </context>
        
        <!-- General macro and request matching -->
        <context id="macro" style-ref="macro" class="no-spell-check">
          <match>^\.[A-Z0-9_]+</match>
        </context>
        
        <context id="request" style-ref="request" class="no-spell-ckeck">
          <match>^\.[a-z]+</match>
        </context>
        
      </include>
    </context>
  </definitions>
  
</language>

It's all right, I already gave up anyway. But thanks for responding. Greetings.