PHP preg_match查找多次出现 [英] PHP preg_match to find multiple occurrences

问题描述

在PHP中使用preg_match查找正则表达式的多次出现的正确语法是什么?

What is the correct syntax for a regular expression to find multiple occurrences of the same string with preg_match in PHP?

例如，在下面的段落中查找以下字符串是否出现了TWICE:

For example find if the following string occurs TWICE in the following paragraph:

$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";
}

推荐答案

您要使用 .这就是代码中的样子.实际函数返回找到的项目数，但是$matches数组将保存结果:

You want to use preg_match_all(). Here is how it would look in your code. The actual function returns the count of items found, but the $matches array will hold the results:

<?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

2 matches found

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