[d--b]

> our pattern becomes:

> \A(?=\w{6,10}\z)(?=[^a-z][a-z])(?=(?:[^A-Z][A-Z]){3})(?=\D\d).

And then these guys wonder why people hate regexes? The "now you have 2 problems" quote fit perfectly for that case.

[pygy_]

The regexp syntax was devised for write-only programming at the terminal (at a time when a terminal was a physical object, not a window in your GUI).

The regular formalism is pretty neat though. There are alternative syntaxes (e.g. multiline regexps in Python) that are better suited for complex matchers.

[jokoon]

Can you put line returns and indents in a regex?

If you escape them it should work, I guess.