A regex from 2011 saved my client's login page last Friday

I was poking at their password field for like an hour trying to catch edge cases and nothing worked, then I remembered an old regex I copied off a forum back in 2011 that was supposed to be junk. Threw it in, and boom, it flagged three weird inputs that their fancy scanner totally missed. Has anyone else kept some random snippet around for years and had it actually pay off?

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