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Home Backend Development PHP Tutorial 正则表达式字符串取反 怎么弄?

正则表达式字符串取反 怎么弄?

Jun 23, 2016 pm 02:24 PM

正则表达式 正则 url

我有一个url规则如下:

mm.[*|a|b|add].cn

其中 a , b , add 表示例外

例如

 mm.a.cn 无法匹配

 mm.x.cn 可以匹配

如何写正则???

我只知道 mm\.[a|b|add]\.cn 可以匹配所有的例外,但是我就是想要一个取反的结果?

回复讨论(解决方案)

$s1= 'mm.a.cn';$s2= 'mm.add.cn';$s3= 'mm.c.cn';$p='/mm\.(.+)(?<!a|b|add)\.cn/';$bool1=preg_match($p,$s1);$bool2=preg_match($p,$s2);$bool3=preg_match($p,$s3);var_dump($bool1,$bool2,$bool3);
Copy after login
Copy after login

int(0) int(0) int(1)

preg_match('#www\.(a|b|add)\.cn#',$str)
Copy after login


要不匹配的话

!preg_match('#www\.(a|b|add)\.cn#',$str)
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只能对LZ说??这个正则很难写的

$s1= 'mm.a.cn';$s2= 'mm.add.cn';$s3= 'mm.c.cn';$p='/mm\.(.+)(?<!a|b|add)\.cn/';$bool1=preg_match($p,$s1);$bool2=preg_match($p,$s2);$bool3=preg_match($p,$s3);var_dump($bool1,$bool2,$bool3);
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int(0) int(0) int(1)
试试 mm.aadd.cn ?

$s =<<< TXTmm.a.cn mm.x.cn mm.aadd.cnmm.c.cnTXT;preg_match_all('/mm\.(?!a|b|add).*?\.cn/s', $s, $r);print_r($r);preg_match_all('/mm\.(?!a\.|b\.|add\.).*?\.cn/s', $s, $r);print_r($r);
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Array
(
    [0] => Array
        (
            [0] => mm.x.cn
            [1] => mm.c.cn
        )

)
Array
(
    [0] => Array
        (
            [0] => mm.x.cn
            [1] => mm.aadd.cn
            [2] => mm.c.cn
        )

)

preg_match_all('/mm\.(?!a\.|b\.|add\.).*?\.cn/s', $s, $r);
可写作
preg_match_all('/mm\.(?!(?:a|b|add)\.).*?\.cn/s', $s, $r);

preg_match_all('/mm\.(?!a\.|b\.|add\.).*?\.cn/s', $s, $r);
可写作
preg_match_all('/mm\.(?!(?:a|b|add)\.).*?\.cn/s', $s, $r);
把后一个字符也加进去,整体作为排除对象啊?受教了

四楼应该可以啊,先结贴了。

无意中看到这个贴的。。
首先。。我不懂PHP,作为正则的角度来说,这个不是很简单么。。
反义排除掉这几个字符就行了:
^mm\.[^ab(?:add)]+\.cn$
[^ab(?:add)] --> 排除a b add

preg_match_all('/mm\.(?!a\.|b\.|add\.).*?\.cn/s', $s, $r);
可写作
preg_match_all('/mm\.(?!(?:a|b|add)\.).*?\.cn/s', $s, $r);

版主这个写法是不是有点多余~

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