PHP的preg_match找到多次发生

Question

什么是正确的语法使用正则表达式查找相同的字符串多次出现用的preg_match在PHP？

例如，如果发现在以下段落中出现两次以下字符串：

$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";
}

Answer 1

您想使用 preg_match_all() 。下面是它会怎样看在你的代码。实际函数返回找到的项的计数，但$matches阵列将保存结果：

<?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：

  结果

2个匹配