That's pretty good, but what if I tried to escape a quote with a backslash?

qq|look, these "words" are \"quoted\"!|;

# results #

[0] look,
[1] these
[2] words are quoted
[3] !
[download]

It's probably a recursive check, which makes it very tough to do as a regex. (Hey, I'm not complaining about your solution, just making sure that people realize a regex won't catch all cases here!)