正则匹配 模式修正符 小写u的有关问题 php

正则匹配 模式修正符 小写u的问题 php
最近看到一段代码：

<br />
<?php<br />
$str = '你好,世界dd';<br />
preg_match_all('/./us', $str, $match);<br />
echo count($match[0])."<br />";  <br />
?><br />

上网查了不少资料，但对于php正则表达式中的模式修正符u实在有些不明白，求解啊……

分享到： 更多

------解决方案--------------------
u ：unicode 的缩写，表示待匹配的串是一个符合 unicode 编码规则的串，比如 utf-8 编码的串
在 u 修饰符下，一个汉字被当做一个字符被处理。\w 有原来的 [_0-9A-Za-z] 扩展到汉字
------解决方案--------------------

$s = '汉字abc';<br />
preg_match_all('/\w/', $s, $r); //没有 u 修饰<br />
print_r($r);<br />

得
Array
(
[0] => Array
(
[0] => a
[1] => b
[2] => c
)

)

$s = '汉字abc';<br />
preg_match_all('/\w/u', $s, $r); //有 u 修饰<br />
print_r($r);<br />

得
Array
(
[0] => Array
(
[0] => 汉
[1] => 字
[2] => a
[3] => b
[4] => c
)

)

------解决方案--------------------

引用:

$s = '汉字abc';<br />
preg_match_all('/\w/', $s, $r); //没有 u 修饰<br />
print_r($r);<br />

得
Array
(
[0] => Array
(
[0] => a
[1] => b
[2] => c
)

)

$s = '汉字abc';<br />
preg_match_all('/\w/u', $s, $r); //有 u 修饰<br />
print_r($r);<br />

得
Array
(
    [0] => Array
        (
            [0] => 汉
            [1] => 字
            [2] => a
            [3] => b
            [4] => c
        )

)
版主大大 写个适合新手学习的正则吧。
还有.net的正则和php的正则区别大吗？
http://deerchao.net/tutorials/regex/regex.htm
这个人写的.net通俗易懂 ，求版主大大同样来个。。。

Related labels：

array gt match nbsp

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