How to use

com.intellij.lexer.FlexAdapter

constructor

 public GoLexer() {
  super(new FlexAdapter(new _GoLexer()), TokenSet.orSet(GoParserDefinition.COMMENTS, GoParserDefinition.WHITESPACES));
 }
}

 public PerlTemplatingMergingLexerAdapter(@Nullable Project project, @NotNull FlexLexer flexLexer, TokenSet tokensToMerge) {
  super(
   new PerlSublexingLexerAdapter(
    project,
    new FlexAdapter(flexLexer), false),
   tokensToMerge
  );
 }
}

@NotNull
@Override
public Lexer createLexer(final Project project) {
  return new FlexAdapter(new ImpexLexer((Reader) null));
}

@Override
protected Lexer createLexer() {
  return new FlexAdapter(new DHighlightingLexer(null));
}

  public BashLexer(BashVersion bashVersion) {
    super(new FlexAdapter(
        new _BashLexer(bashVersion, null)),
        MergeTuple.create(TokenSet.create(STRING_DATA), STRING_CONTENT),
        MergeTuple.create(TokenSet.create(HEREDOC_LINE), HEREDOC_CONTENT));
  }
}