i just got pwned!
thanks, andrew. i should've paid more attention to what i was reading.
- isaac
On Fri, Jul 10, 2009 at 11:19 AM, Andrew Ballard <aballard@xxxxxxxxx> wrote:
> On Fri, Jul 10, 2009 at 10:30 AM, Isaac Dover<isaacdover@xxxxxxxxx> wrote:
> >> On Wed, Jul 8, 2009 at 11:32 PM, WenDong Zhang <zwd2005@xxxxxxxxx>
> wrote:
> >> On Thu, Jul 9, 2009 at 6:00 AM, Per Jessen <per@xxxxxxxxxxxx> wrote:
> >> > A suitable regex might look something like this:
> >> >
> >> > /([0-9]+)\1+/
> >> >
> >> > Not tested, probably won't work on the first try. You may need
> >> > greediness adjustments.
> >> >
> >> >
> >> > /Per
> >>
> >> yes
> >> (\d+?)\1+ works fine
> >>
> >>
> >>
> >> --
> >> Best Regards!
> >> Wen Dong
> > those regex patterns wouldn't solve his problem. he wants to pull
> > repetitions from the string _before_ knowing a pattern. those patterns
> will
> > match the entire source string
> >
> > - isaac
>
> Those patterns look like a pretty good starting point to me. True, the
> first captured result of preg_match would be the entire string, but
> the submatches array would contain the actual sequence that is
> repeated:
>
> <?php
>
> $pattern = '/(\d+?)\1+/';
>
> $subject = '032258064516129032258064516129032258064516129032258064516129';
> if (preg_match($pattern, $subject, $matches)) {
> var_dump($matches);
> }
>
> /*
> array(2) {
> [0]=>
> string(60) "032258064516129032258064516129032258064516129032258064516129"
> [1]=>
> string(15) "032258064516129"
> }
> */
>
> $subject = '037037037037037037037037037037037037037037037037037037037037';
> if (preg_match($pattern, $subject, $matches)) {
> var_dump($matches);
> }
> /*
> array(2) {
> [0]=>
> string(60) "037037037037037037037037037037037037037037037037037037037037"
> [1]=>
> string(3) "037"
> }
> */
>
> $subject = '333333333333333333333333333333333333333333333333333333333333';
> if (preg_match($pattern, $subject, $matches)) {
> var_dump($matches);
> }
> /*
> array(2) {
> [0]=>
> string(60) "333333333333333333333333333333333333333333333333333333333333"
> [1]=>
> string(1) "3"
> }
> */
>
> ?>
>
>
>
> Some slight adjustments to the pattern could also be useful.
>
> // This would catch a pattern of any repeating characters, not just
> numeric digits
> $pattern = '/(.+?)\1+/';
>
> // This would only match if the entire string was a repeated sequence
> $pattern = '/^(\d+?)\1+$/';
>
> // This would match the repeated sequence only if the string began
> with a repeated sequence.
> $pattern = '/^(\d+?)\1+/';
>
> // This would match the repeated sequence only if the string ended
> with a repeated sequence.
> $pattern = '/(\d+?)\1+$/';
>
> If a string had multiple sequences, you could also use preg_match_all
> to find each sequence, but that looks a bit more involved than the OP.
>
> None of these require knowing the sequence in advance. How do they not
> satisfy the OP?
>
> Andrew
>
