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<!DOCTYPE html>
<html>
<body>
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<h1>正则表达式修饰符：o{3,}</h1>
​
<p>在文本 "W3School is goooooood" 中，有多少个至少连续出现 3 个 o（ooo）的情况？</p>
​
<?php
$txt = "W3School is goooooood";
$pattern = "/o{3,}/";
echo preg_match_all($pattern, $txt);
?>  
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<p>匹配到的位置如下：</p>
​
<?php
echo preg_replace($pattern, "#", $txt);
?>  
​
<p>（每个匹配项被替换为 # 字符）</p>
​
</body>
</html>