Restrict special characters in android password edittext

Question

I am working on a project where the user is allowed to type only password with letters , alphabets and special characters like ( @.#$%^& _-&* ) alone in a edittext. I tried various methods like. **Note : space is strictly restricted

Method 1:

setting digits in layout as follows

android:digits="0,1,2,3,4,5,6,7,8,9,*@#$%_-\\^.&<qwertzuiopasdfghjklyxcvbnmABCDEFGHIJKLMNOPQRSTUVWXYZ"

This method is working fine but i could able to type brackets '(', semicolon ';' and i could not type slash '\\' (which i have added in the digits tag)

Method 2:

By trying regex with following method

public static boolean limitPasswordCharacters(String about){
        // UserName Validation Pattern String
        final Pattern USER_NAME_PATTERN = Pattern.compile("^[a-zA-Z0-9@.#$%^&*_&\\]+$");
        if(USER_NAME_PATTERN.matcher(about).matches()){
            return true;            
        }
        return false;
    }

But unfortunately gettting exception as

11-17 16:18:11.155: E/AndroidRuntime(15877): java.util.regex.PatternSyntaxException: Missing closing bracket in character class near index 22:
11-17 16:18:11.155: E/AndroidRuntime(15877): [a-zA-Z0-9@.#$%^&*_&\]

Answer 1

Change your pattern like below,

final Pattern USER_NAME_PATTERN = Pattern.compile("^[a-zA-Z0-9@.#$%^&*_&\\\\]+$");

In java regex, to mean a backslash, you need to escape it three times. Java consider this \\\\] as a lietral ] bracket.

Example:

String digits="0,1,2,3,4,5,6,7,8,9,*@#$%_-\\^.&<qwertzuiopasdfghjklyxcvbnmABCDEFGHIJKLMNOPQRSTUVWXYZ";
System.out.println(digits.matches("^[-a-zA-Z0-9@.#$%^&*_&,<\\\\]+$")); //true

Answer 2

只需将此行粘贴到您的编辑文本中

android:digits="0123456789qwertzuiopasdfghjklyxcvbnm "