Allowing question mark with alphanumeric and spaces with other characters in regex

Question

I am using PHP preg_match() to check a regex list. The function is checking for alphanumeric, spaces, underscores, dashes, asterisk and question mark. But it only takes all the above except question mark and asterisk.

return (bool) preg_match('/^[a-z0-9 _-]+$/i', $str);

Answer 1

The function is check for alphanumeric, spaces, underscore, dashes, asterix and question mark, but it only takes all the above except question mark and asterix

Because there is no ? or * in your character class . Try

return (bool) preg_match('/^[\w*? -]+$/', $str);

\\w already contains [A-Za-z0-9_]

See demo at regex101

Answer 2

这是因为您将需要转义其他字符，因为它们是保留的特殊字符。

return (bool) preg_match('/^[a-z0-9 _-\?\*]+$/i', $str);