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Re^7: Finding repeat sequences. (only mostly regex)

by choroba (Canon)
on Jun 18, 2013 at 20:44 UTC ( #1039663=note: print w/ replies, xml ) Need Help??

in reply to Re^6: Finding repeat sequences. (only mostly regex)
in thread Finding repeat sequences.

Right. In fredfr, the ed will be matched by the .* between the repetitions. It corresponds to the missing part of the last repetition. Or am I missing something?

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Re^8: Finding repeat sequences. (Sorry!)
by BrowserUk (Pope) on Jun 18, 2013 at 20:56 UTC

    I am so sorry. You've done the same flip that tye did, capturing the partial rep rather than the complete rep. Threw me completely.

    With a couple of enhancements that works for the 1 rep/1 partial case:

    $s = 'aaaabaaaabaaaaabaaaab';; $s =~ /^((.*).*)\2$/ and print "$1/$2";; aaaabaaaaba/aaaabaaaab

    And still works for that when enhanced to allow for more than 1 complete rep:

    $s =~ /^((.*).*)\1*\2$/ and print "$1/$2";; aaaabaaaaba/aaaabaaaab

    But then fails when given more than one complete rep:

    $s = 'aaaabaaaabaaaaabaaaabaaaaabaaaab';; $s =~ /^((.*).*)\1*\2$/ and print "$1/$2";; aaaabaaaabaaaaabaaaaba/aaaabaaaab

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