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  1. #1
    captainpirate is offline Member
    Join Date
    May 2011
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    Default userName/password Regular Expression

    I have made a swing that takes userName/password as input.
    I'm totally newbie to regular expression.
    What i want is the regular expression for userName is
    - between 5-30 character
    - may contain letter
    - may be alphanumeric
    - may contain _ or . or both or starting letter may be number or letter.
    - doesnt start with number or _ or .
    - disallow any other special character or symbol.

    And Password must be :
    - between 6-30
    - may be alphanumeric
    - must contain at least one numeric digit
    - may contain _ or . @ or # or ! or - or all.
    Help me.

  2. #2
    pbrockway2 is offline Moderator
    Join Date
    Feb 2009
    New Zealand
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    Default Re: userName/password Regular Expression

    I wouldn't use a regular expression.

    I'm not saying it can't be done with a regular expression. But regular expressions are even more complicated than your password requirements! ;) I'd be looking at String and Character methods to see if they couldn't be pressed into service.

  3. #3
    captainpirate is offline Member
    Join Date
    May 2011
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    Default Re: userName/password Regular Expression

    Sorry for the late reply.
    I have use Regex library as:
    For userName:

    public static boolean isUserNameValid(String name) {
    boolean isValid = false;
    String expression = "^[a-zA-Z0-9.-]{5,30}$";
    CharSequence inputStr = name;
    Pattern pattern = Pattern.compile(expression, Pattern.CASE_INSENSITIVE);
    Matcher matcher = pattern.matcher(inputStr);
    if (matcher.matches()) {
    isValid = true;
    return isValid;

    For Password :
    String expression = "((?=.*\\d)(?=.*[a-z])(?=.*[A-Z]).{6,30})";

    Thanks @pbrockway2 for the reply.

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