​x
 
<!DOCTYPE html>
<html>
<body>
​
<h1>正则表达式修饰符：[T-e]</h1>
​
<p>在文本 "Welcome to W3School" 中，有多少个字母在大写 "T" 和小写 "e" 之间？</p>
​
<?php
$txt = "Welcome to W3School";
$pattern = "/[T-e]/";
echo preg_match_all($pattern, $txt);
?>  
​
<p>匹配到的位置如下：</p>
​
<?php
echo preg_replace($pattern, "#", $txt);
?>  
​
<p>（每个匹配项被替换为 # 字符）</p>
​
</body>
</html>