I'm trying to extend this regex to match 3 of 4 submatches.

First, you have 5 submatches, not 4

Then, let's fix what you already have. 

/^.*(?=.{10,})(?=.*\d)(?=.*[a-z])(?=.*[A-Z])(?=.*[@#$%^&+=]).*$/

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should be 
/^(?=.{10})(?=.*\d)(?=.*[a-z])(?=.*[A-Z])(?=.*[@#\$%^&+=])/s

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In short, .*.* is (very) slow and useless. Similarly, /.{10,}/ also does needless work compared to /.{10}/. And of course, you didn't mean to use the variable $%.

That whole thing means 

/.{10}/s && /\d/ && /[a-z]/ && /[A-Z]/ && /[@#\$%^&+=]/

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so you could do 
lenght() >= 10 && /\d/&&1 + /[a-z]/&&1 + /[A-Z]/&&1 + /[@#\$%^&+=]/&&1
+ == 4
    or die;

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or 
use List::Util qw( sum );

lenght() >= 10 && sum( /\d/, /[a-z]/, /[A-Z]/, /[@#\$%^&+=]/ ) == 4
    or die;

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"&& 1" is required in scalar context since m// is not guaranteed to return 1 for successful matches in scalar context.

But you really want that in a match op, don't you? 

m{
    (?{ 0 })
    ^
    (?>
        (?=.{10})
        (?=.* \d          (?{ $^R+1 }) | )
        (?=.* [a-z]       (?{ $^R+1 }) | )
        (?=.* [A-Z]       (?{ $^R+1 }) | )
        (?=.* [@#\$%^&+=] (?{ $^R+1 }) | )
    )
    (?(?{ $^R != 3 })(?!))
}xs
    or die;

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Update: AnomalousMonk pointed to me that $% is a bug. I adjusted the post accordingly.

In reply to Re: Password Regex optimization by ikegami
in thread Password Regex extended by 3dbc

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