It's not something we need to implement - it's already implemented by the lexer.

To be exact, underscores denote an unused variable (called a "singleton"). The lexer maps them to SCE_VISUALPROLOG_ANONYMOUS:

  } else if (sc.Match('_')) {
      sc.SetState(SCE_VISUALPROLOG_ANONYMOUS);

Only words in proper title-case are styled as SCE_VISUALPROLOG_VARIABLE:

  } else if (isUpperLetter(sc.ch)) {
      sc.SetState(SCE_VISUALPROLOG_VARIABLE);

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