private static void parseMysqlCharExpression(PsiBuilder builder) {
    final PsiBuilder.Marker marker = builder.mark();
    builder.advanceLexer();
    if (builder.getTokenType() == RegExpTT.NAME) {
      builder.advanceLexer();
    }
    else {
      checkMatches(builder, RegExpTT.CHARACTER, RegExpBundle.message("parse.error.character.or.mysql.character.name.expected"));
    }
    checkMatches(builder, RegExpTT.MYSQL_CHAR_END, RegExpBundle.message("parse.error.unclosed.mysql.character.expression"));
    marker.done(RegExpElementTypes.MYSQL_CHAR_EXPRESSION);
  }
private static void parseMysqlCharExpression(PsiBuilder builder)