Comments - Do not understand why MariaDB rejected REGEXP with 42000 You have an error in your SQL syntax
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I do not know how to perform a wireshark trace of the MariaDB client server connection. As to the PHP level my development system is running PHP Version 7.3.11-0ubuntu0.19.10.2 with mysqlnd 5.0.12-dev - 20150407 and MariaDB 10.3.20-MariaDB-0ubuntu0.19.10.1. Those are quite current as I am running the latest available release of Ubuntu. As noted in the original post my production system is currently running PHP Version 7.2.24-0ubuntu0.18.04.2 with MySQL 5.7.28-0ubuntu0.18.04.4 which is still quite current. So I am experiencing the problem across a broad range of environments. In both cases PHP and the SQL server are on the same host.