pattern with escaped '#' breaks pattern validation

[pjordaan]

I have a generated regular expression from PHP code and because it uses preg_quote() the final regular expression escapes the '#' even though it is not required

The regular expression that is generated in my JSON schema is:

^(?=(.*[a-z]){1,})(?=(.*[A-Z]){1,})(?=(.*[0-9]){1,})(?=(.*[\!@\#\$%\^&\*\(\)\-_\+\.]){1,}).{6,42}$

The pattern validation in class Pattern adds the # delimiter around it and replaces '#' with '\#' for the call to preg_match. Resulting in this preg_match pattern:

#^(?=(.*[a-z]){1,})(?=(.*[A-Z]){1,})(?=(.*[0-9]){1,})(?=(.*[\!@\\#\$%\^&\*\(\)\-_\+\.]){1,}).{6,42}$#u

This results in an error in the openapi psr7 validator: "preg_match(): Unknown modifier '\'"

preg_match(): Unknown modifier '\'

./vendor/league/openapi-psr7-validator/src/Schema/Keywords/Pattern.php:43
./vendor/league/openapi-psr7-validator/src/Schema/SchemaValidator.php:97
./vendor/league/openapi-psr7-validator/src/Schema/Keywords/Properties.php:85
./vendor/league/openapi-psr7-validator/src/Schema/SchemaValidator.php:139

Basically only # should be escaped in class Pattern if # is not already escaped. I could fix it for myself by unescaping it in the OpenAPI spec, but maybe it is a good idea to fix this in the validator as preg_quote() always escapes '#' even if you do not provide it as a delimiter