PHP preg_match查找多次出现

Question

PHP preg_match查找多次出现

正则表达式在PHP中使用preg_match查找多次出现的相同字符串的正确语法是什么？

例如，在以下段落中查找以下字符串是否出现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";

}