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Check that characters in a variable are alpha numeric using ereg

<?php // Example 1$text = "onlyalphanumericcharacters012345"; if (ereg('[^A-Za-z0-9]', $text)) { echo "This contains characters other than letters and numbers";} else { echo "This contains only letters and numbers"; } // Example 2$text = "mixedcharacters012345&../@"; if (ereg('[^A-Za-z0-9]', $text)) { echo "This contains characters other than letters and numbers";} else { echo "This contains only letters and numbers"; } ?>