PHP preg_match查找多次出現正則表達式在PHP中使用preg_match查找多次出現的相同字符串的正確語法是什么？例如，在以下段落中查找以下字符串是否出現TWICE：$string = "/brown fox jumped [0-9]/";$paragraph = "The brown fox jumped 1 time over the fence. The green fox did not. Then the brown fox jumped 2 times over the fence"if (preg_match($string, $paragraph)) {echo "match found";}else {echo "match NOT found";}