regex - PHP preg_grep not working? -

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$filenamematchregex = ^a-[0-9]*_b-[0-9]*_c-.*(_d-on)?_((19|20)\d\d[- /.](0[1-9]|1[012])[- /.](0[1-9]|[12][0-9]|3[01]))-[0-9]*\.csv$  $filenames =   array   (     [0] => index.html     [1] => a-34234234_b-3271_c-123_d-on_2013-08-12-10.csv     [2] => a-52342345_b-3271_c-123_d-on_2013-08-12-11.csv     [3] => a-8764453_b-3271_c-123_d-on_2013-08-12-12.csv     [4] => a-7654334_b-3271_c-1234_d-on_2013-08-12-4.csv     [5] => a-3435_b-3271_c-23re_d-on_2013-08-12-5.csv     [6] => a-909876_b-3271_c-wef2r2_d-on_2013-08-12-6.csv     [7] => a-345456_b-3271_c-23rwef_d-on_2013-08-12-7.csv     [8] => a-98765_b-3271_c-23ref_d-on_2013-08-12-8.csv     [9] => a-098765_b-3271_c-wef2r_d-on_2013-08-12-9.csv )  $matchingfilenames  = preg_grep ("/".$filenamematchregex."/", $filenames);

this works here...i match on 1-9: regex tester

its working fine me

    $filenames = explode(',', "index.html,a-34234234_b-3271_c-123_d-on_2013-08-12-10.csv,a-52342345_b-3271_c-123_d-on_2013-08-12-11.csv,a-8764453_b-3271_c-123_d-on_2013-08-12-12.csv,a-7654334_b-3271_c-1234_d-on_2013-08-12-4.csv,a-3435_b-3271_c-23re_d-on_2013-08-12-5.csv,a-909876_b-3271_c-wef2r2_d-on_2013-08-12-6.csv,a-345456_b-3271_c-23rwef_d-on_2013-08-12-7.csv,a-98765_b-3271_c-23ref_d-on_2013-08-12-8.csv,a-098765_b-3271_c-wef2r_d-on_2013-08-12-9.csv");     $filenamematchregex = '^a-[0-9]*_b-[0-9]*_c-.*(_d-on)?_((19|20)\d\d[- /.](0[1-9]|1[012])[- /.](0[1-9]|[12][0-9]|3[01]))-[0-9]*\.csv$';     $matchingfilenames  = preg_grep ("#".$filenamematchregex."#", $filenames);      print_r($filenames);     print_r($matchingfilenames);

but used '#' around regexp delimiter, regexp included '/', proberly need escape '/' or chose better delimiter


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