note 120800 deleted from function.preg-match by cmb

Note Submitter: mips at foshin dot com ---- Beware that while a non-matching optional parenthesized subpattern will be stored in $matches as an empty string ("") if there's at least one match following it, one or more at the end of the array will be omitted entirely! Poor example: <?php // Slightly modified, this checks for a valid, real number. Here, it stores the dash, whole part, and period with decimals in $matches. // Testing ".1": preg_match("/^(-)?(\\d+)?(\\.\\d+)?\$/", ".1", $matches); var_dump($matches); /* array(4) { [0]=> string(2) ".1" [1]=> string(0) "" [2]=> string(0) "" [3]=> string(2) ".1" */ // Testing "-": preg_match("/^(-)?(\\d+)?(\\.\\d+)?\$/", "-", $matches); var_dump($matches); /* array(2) { [0]=> string(1) "-" [1]=> string(1) "-" */ ?> Notice that $matches[2] here is either "" or not set at all for the exact same result (not found).