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Re^3: Prime Number Finder

by Anonymous Monk
on Mar 07, 2005 at 14:41 UTC ( #437224=note: print w/replies, xml ) Need Help??

in reply to Re: Re: Prime Number Finder
in thread Prime Number Finder

How does this work?

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Re^4: Prime Number Finder
by tall_man (Parson) on Mar 08, 2005 at 00:04 UTC
    The regular expression match tries to break the string "111.." (a string of 1's as long as your input number) into some number of equal-length pieces of length two or more. It uses non-greedy matching, so it starts with the smallest possible and works up.. "11","111","1111" and so on. This is the same order of efficiency as the OP's prime test loop (one at a time), but it uses the regular expression engine.

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