Regular Expression In Android for Password Field

Question

How can i validating the EditText with Regex by allowing particular characters . My condition is :

Password Rule:

1. On

Answer 1

try {
    if (subjectString.matches("^(?=.*[@$%&#_()=+?»«<>£§€{}\\[\\]-])(?=.*[A-Z])(?=.*[a-z])(?=.*\\d).*(?<=.{4,})$")) {
        // String matched entirely
    } else {
        // Match attempt failed
    } 
} catch (PatternSyntaxException ex) {
    // Syntax error in the regular expression
}


(?=.*[@\$%&#_()=+?»«<>£§€{}.[\]-]) -> must have at least 1 special character
(?=.*[A-Z])   -> Must have at least 1 upper case letter
(?=.*[a-z])   -> Must have at least 1 lower case letter
(?=.*\\d)     -> Must have at least 1 digit
(?<=.{4,})$") -> Must be equal or superior to 4 chars.