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问题:
I not getting the desired effect from a script. I want the password to contain A-Z, a-z, 0-9, and special chars.
- A-Z
- a-z
- 0-9 >= 2
- special chars >= 2
- string length >= 8
So I want to force the user to use at least 2 digits and at least 2 special chars. Ok my script works but forces me to use the digits or chars back to back. I don't want that. e.g. password testABC55$$ is valid - but i don't want that.
Instead I want test$ABC5#8 to be valid. So basically the digits/special char can be the same or diff -> but must be split up in the string.
PHP CODE:
$uppercase = preg_match('#[A-Z]#', $password); $lowercase = preg_match('#[a-z]#', $password); $number = preg_match('#[0-9]#', $password); $special = preg_match('#[\W]{2,}#', $password); $length = strlen($password) >= 8; if(!$uppercase || !$lowercase || !$number || !$special || !$length) { $errorpw = 'Bad Password';
回答1:
Using "readable" format (it can be optimized to be shorter), as you are regex newbie >>
^(?=.{8})(?=.*[A-Z])(?=.*[a-z])(?=.*\d.*\d.*\d)(?=.*[^a-zA-Z\d].*[^a-zA-Z\d].*[^a-zA-Z\d])[-+%#a-zA-Z\d]+$
Add your special character set to last [...] in the above regex (I put there for now just -+%#).
Explanation:
^ - beginning of line/string (?=.{8}) - positive lookahead to ensure we have at least 8 chars (?=.*[A-Z]) - ...to ensure we have at least one uppercase char (?=.*[a-z]) - ...to ensure we have at least one lowercase char (?=.*\d.*\d.*\d - ...to ensure we have at least three digits (?=.*[^a-zA-Z\d].*[^a-zA-Z\d].*[^a-zA-Z\d]) - ...to ensure we have at least three special chars (characters other than letters and numbers) [-+%#a-zA-Z\d]+ - combination of allowed characters $ - end of line/string
回答2:
((?=(.*\d){3,})(?=.*[a-z])(?=.*[A-Z])(?=(.*[!@#$%^&]){3,}).{8,})
test$ABC5#8 is not valid because you ask more than 2 digits and spec symbols
A-Z a-z 0-9 > 2 special chars > 2 string length >= 8
回答3:
For matching length of string including special characters:
$result = preg_match('/^(?=.[a-z])(?=.[A-Z])(?=.\d)(?=.[^A-Za-z\d])[\s\S]{6,16}$/', $string);
Answer explained: https://stackoverflow.com/a/46359397/5466401
