php - get number from file with regexp? -

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i've got files named 

1234_crob.jpg 1234.jpg 2323_örja.bmp 2323.bmp etc.

how can retrieve numbers e.g. 1234 , 2323?

if file names start numbers there no need use regular expressions, try instead:

foreach (glob('/path/to/dir/{0,1,2,3,4,5,6,7,8,9}*', glob_brace) $file) {     echo $file . ' = ' . intval(basename($file)) . "<br />\n"; }

this updated glob pattern match filenames start digit, requested.

@ghostdog74: you're right.

foreach (glob('/path/to/dir/{0,1,2,3,4,5,6,7,8,9}*', glob_brace) $file) {     echo $file . ' = ' . filter_var(basename($file), filter_sanitize_number_int) . "<br />\n"; }

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