Regex / matcher string filters

What is the problem or goal the end user is trying to solve or accomplish?

Filter a string column for values matching a pattern.

How are they solving it currently?

If it's the simplest kind of pattern (string-contains) you can type it and then click every single value in the drop-down (or 'select all' if there are few enough values). If the pattern is more complex than that, you're out of luck.

What is the recommended solution by the Customer?

It would be great if we could have filters that allow for regular expressions, or SQL-"like"-semantics.