Analyse de la façon dont PHP utilise preg_split() pour diviser les caractères spéciaux (métacaractères, etc.)

本文实例讲述了PHP使用preg_split()分割特殊字符(元字符等)的方法。分享给大家供大家参考，具体如下：

这里所说的特殊字符就是正则中使用的特殊字符,如: | . + 等

其它的先不说,来个实例:

$pattern="/[,-\\|\\.]/";
$subject="aaa,bbb,ccc-ddd-eee-fff|ggg|hhh.iii.jjj.kkk";
$spr=preg_split($pattern, $subject);
print_r($spr);

结果:

Array ( [0] => [1] => [2] => [3] => [4] => [5] => [6] => [7] => [8] => [9] => [10] => [11] => [12] => [13] => [14] => [15] => [16] => [17] => [18] => [19] => [20] => [21] => [22] => [23] => [24] => [25] => [26] => [27] => [28] => [29] => [30] => [31] => [32] => [33] => [34] => [35] => [36] => [37] => [38] => [39] => [40] => [41] => [42] => [43] => )

很显然,这不是我们想要的结果,郁闷了好一会,才找到是什么原因:

把正则表达式内的特殊字符放到前面就没事了, 也就是

$pattern="/[\\|\\.,-]/";

结果:

Array ( [0] => aaa [1] => bbb [2] => ccc [3] => ddd [4] => eee [5] => fff [6] => ggg [7] => hhh [8] => iii [9] => jjj [10] => kkk )

好了,这就是我们要的结果了

总结:当使用正则表达式中的元字符,普通字符进行 [ ]内的多个字符分割的时候,要把待转义的元字符放在前面.

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