When searching in the pages widget in the UI, I entered ?, searched and got a bunch of errors back. (I was looking for pages with query strings.) A similar set of errors happens when searching for other characters like [ and *
One of the stack traces (they are all pretty much identical):
There is an error. Please report the message (Piwik 2.4.1) and full backtrace in the Piwik forums (please do a Search first as it might have been reported already!).
Warning: preg_match(): Compilation failed: nothing to repeat at offset 0 in ......\piwik\core\DataTable\Filter\Pattern.php on line 72
Backtrace -->
#0 Piwik\Error::errorHandler(...) called at [:]
#1 preg_match(...) called at [......\piwik\core\DataTable\Filter\Pattern.php:72]
#2 Piwik\DataTable\Filter\Pattern::match(...) called at [......\piwik\core\DataTable\Filter\PatternRecursive.php:80]
#3 Piwik\DataTable\Filter\PatternRecursive->filter(...) called at [......\piwik\core\DataTable\Filter\PatternRecursive.php:71]
#4 Piwik\DataTable\Filter\PatternRecursive->filter(...) called at [......\piwik\core\DataTable.php:425]
#5 Piwik\DataTable->filter(...) called at [......\piwik\core\API\DataTableGenericFilter.php:169]
#6 Piwik\API\DataTableGenericFilter->applyGenericFilters(...) called at [......\piwik\core\API\DataTableGenericFilter.php:42]
#7 Piwik\API\DataTableGenericFilter->filter(...) called at [......\piwik\core\Plugin\Visualization.php:576]
#8 Piwik\Plugin\Visualization->applyGenericFilters(...) called at [......\piwik\core\Plugin\Visualization.php:319]
#9 Piwik\Plugin\Visualization->applyFilters(...) called at [......\piwik\core\Plugin\Visualization.php:171]
#10 Piwik\Plugin\Visualization->buildView(...) called at [......\piwik\core\Plugin\ViewDataTable.php:374]
#11 Piwik\Plugin\ViewDataTable->render(...) called at [......\piwik\core\Plugin\Controller.php:281]
#12 Piwik\Plugin\Controller->renderReport(...) called at [......\piwik\plugins\Actions\Controller.php:88]
#13 Piwik\Plugins\Actions\Controller->getPageUrls(...) called at [:]
#14 call_user_func_array(...) called at [......\piwik\core\FrontController.php:531]
#15 Piwik\FrontController->doDispatch(...) called at [......\piwik\core\FrontController.php:84]
#16 Piwik\FrontController->dispatch(...) called at [......\piwik\core\dispatch.php:34]
#17 require_once(...) called at [......\piwik\index.php:47]
Not a big deal, but I thought you’d want to see it. Hope this isn’t a duplicate. I searched and didn’t find anything that looked the same.