在PHP中，正则表达式用preg_match查找同一字符串的多次出现的正确语法是什么？
例如，查找以下字符串是否在以下段落中出现两次:
$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, $paragraph)) {
echo "match found";
}else {
echo "match NOT found";
}
您希望使用PREG_MATCH_ALL()。 下面是它在您的代码中的外观。 实际函数返回找到的项的计数，但$matches数组将保存结果:
<?php
$string = "/brown fox jumped [0-9]/";
$paragraph = "The brown fox jumped 1 time over the fence. The green fox did not. Then the brown fox jumped 2 times over the fence";
if (preg_match_all($string, $paragraph, &$matches)) {
echo count($matches[0]) . " matches found";
}else {
echo "match NOT found";
}
?>
将输出:
找到2个匹配项
