setRegex example

$this->consumeWhitespaces();
            if (!($value = $this->parseLiteral())) {
                throw new Exception("Missing attribute value");
            }
            $part->setValue($value[0]);
            if ($value[1]) {
                if ($operator != "=") {
                    throw new Exception(
                        "Only '=' operator is valid for attribute regex match"
                    );
                }
                $part->setRegex(true);
            }
            $this->consumeWhitespaces();
            if ($this->consume("i")) {
                if (!is_string($value[0]) || $value[1]) {
                    throw new Exception(
                        "Case insensitive flag can be used only for string values"
                    );
                }
                $part->setCaseInsensitive(true);
                $this->consumeWhitespaces();
            }
        }