来自字符串php的Escape（）％[] [关闭]

Question

With this code I can remove all special characters from string in php:

   function noSpeCha($string) {
     return preg_replace('/[^a-zA-Z0-9_ %\[\]\.\(\)%&-]/s', '', $string);
   }

But I need remove those characters too:

( ) % [ ]

I dont know how proceed.

Answer 1

[^n] is a regular expression pattern that matches characters not between the square braces (in this case it would match characters that are not n).

If you want change your existing regex to match %, (, ), [, and ], you'd need to remove them from the [^...] block (along with their escape characters).

preg_replace('/[^a-zA-Z0-9_ %\[\]\.\(\)%&-]/s', '', $string);
                            ^^^^^  ^^^^^

_{which leaves you with}

preg_replace('/[^a-zA-Z0-9_ \.&-]/s', '', $string);

_{tidying things up a bit gives us...}

preg_replace('/[^a-z0-9_ .&-]/si', '', $string);