I like the example using well-named local variables to put together the regular expression into something really readable. It reminds me of the chapters in Uncle Bob's Clean Code book on naming using functions and local variables.
When reading the code, unless you're specifically debugging the regular expression, you don't really need to get into the details of validating what the regular expression is doing.
When reading the code, unless you're specifically debugging the regular expression, you don't really need to get into the details of validating what the regular expression is doing.