I believe this has been done with such database engines as SQL Server and PostgreSQL. 

However, the Firebird Database Engine has a stricter standard as to what is implemented in the SQL language than other such engines.  Nonetheless, it appears that there is some similar capabilities as the following link describes...  https://stackoverflow.com/questions/21432507/repetitions-with-regexes-in-firebird

It may be more convenient to pull out data via a Regex expression in SQL code but it is rather redundant since all of the major development languages already support extensive Regex pattern matching capabilities...

Steve Naidamast

Sr. Software Engineer