[英]PHP preg_match to find multiple occurrences
What is the correct syntax for a regular expression to find multiple occurrences of the same string with preg_match in PHP? 正则表达式使用PHP中的preg_match查找多次出现的相同字符串的正确语法是什么?
For example find if the following string occurs TWICE in the following paragraph: 例如,查找以下段落中是否在TWICE中出现以下字符串:
$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";
}
You want to use preg_match_all()
. 您想使用
preg_match_all()
。 Here is how it would look in your code. 这就是代码中的样子。 The actual function returns the count of items found, but the
$matches
array will hold the results: 实际函数返回找到的项目数,但是
$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
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