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    \$\begingroup\$ ... WE HAVE A WINNER. \$\endgroup\$ Commented Dec 28, 2015 at 15:11
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    \$\begingroup\$ Just btw, I'd say the number of matches is infinite. The empty string can repeat an unlimited number of times and be matched infinitely. \$\endgroup\$ Commented Dec 28, 2015 at 15:19
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    \$\begingroup\$ @nicael Luckily, that's not how regex works. ;) \$\endgroup\$ Commented Dec 28, 2015 at 15:19
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    \$\begingroup\$ @MartinBüttner that depends on your regex engine. I've definitely encountered systems that will crap out if you ever try to match the empty string. \$\endgroup\$ Commented Dec 28, 2015 at 16:30
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    \$\begingroup\$ @LorenPechtel that rule applies only to quine challenges where the empty program is trivially a solution in most languages. I think it's fair game here, since this empty program actually has non-trivial semantics and Retina does not have this behaviour because of challenges like this but because it's the only consistent generalisation of its behaviour for all single-line programs. \$\endgroup\$ Commented Dec 30, 2015 at 7:27