private void append(SqlRegex expr, SqlExprBuilder filter)
throws UnsupportedRdbmsOperatorException {
SqlRegexBuilder regex = filter.regex();
dispatch(expr.getArg(), regex.value());
dispatch(expr.getPatternArg(), regex.pattern());
SqlExpr flags = expr.getFlagsArg();
if (flags != null) {
dispatch(flags, regex.flags());
}
regex.close();
}