Comment Re:if the asteroid is too big (Score 1) 152
If you detect it in time a small nudge may be all you need. These things travel rather long distances, a small nudge is enough to make it miss earth altogether.
No, regular expressions can not capture the complexity of that formula since it's an algorithm without memory, but with a finite set of numbers the can describe every possible match. You'll end up with a regex that incredibly long though, e.g. for 3 digits:
^0(12|23|31|47|51|69|74|83|92|01)|1(12|23|31|47|51|69|74|83|92|01)... (etc)
(It will be 5 times longer in total and the last digits aren't the correct one, it's only for showing the principle)
So it's possible but impractical.
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