How to remove non

2018-06-20 16:47:51

I need to remove all characters from a string which aren't in az AZ 0-9 set or are not spaces.

Does anyone have a function to do this?

听起来你几乎已经知道你想要做什么，你基本上将它定义为一个正则表达式。

preg_replace("/[^A-Za-z0-9 ]/", '', $string);

对于unicode字符，它是：

preg_replace("/[^[:alnum:][:space:]]/u", '', $string);

Regular expression is your answer.

$str = preg_replace('/[^a-zd ]/i', '', $str);

The i stands for case insensitive.

^ means, does not start with.

d matches any digit.

az matches all characters between a and z . Because of the i parameter you don't have to specify az and AZ .

After d there is a space, so spaces are allowed in this regex.

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