PHP preg_match 查找多次出现
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PHP preg_match to find multiple occurrences
提问by Marcus
What is the correct syntax for a regular expression to find multiple occurrences of the same string with preg_match in PHP?
在 PHP 中使用 preg_match 查找同一字符串多次出现的正则表达式的正确语法是什么？
For example find if the following string occurs TWICE in the following paragraph:
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";
}
回答by Doug Neiner
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 $matchesarray will hold the results:
您想使用preg_match_all(). 这是它在您的代码中的外观。实际函数返回找到的项目数，但$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";
}
?>
Will output:
将输出：
2 matches found
找到 2 个匹配项
