UNICODE Regex in java

Question

In a combined regex it looks like working and it is failing when am using it in pattern. please help.

^(?=.*\\p{Nd})(?=.*\\p{L})(?!.*(.{2,})\\1).{5,12}$

this seems to be working but when I split it's failing.

^(?=.*\\p{Nd})(?=.*\\p{L})

Also I am looking for UNICODE validation to ignore any special character and just accept mixture of letters/Alpha & digits (atleast one alpha and one digit)

public void setValidations(){
        validation1 = "^(?=.*\\p{Nd})(?=.*\\p{L})"; //this is failing
        validation2 = "^.{5,12}$";
        validation3 = "(\\S+?)\\1";
        p1 = Pattern.compile(validation1);
        p3 = Pattern.compile(validation3);
    }
    public boolean validateString(String str){
        matcher1 = p1.matcher(str);
        matcher3 = p3.matcher(str);
        if(matcher1.find()){ //Expecting string passed "invalid" to fail (no numeric in it)
            System.out.println(str + " String must have letters & number at least one");
            return false;
        }
        if (!str.matches(validation2)){
            System.out.println(str  + " String must be between 5 and 12 chars in length");
            return false;
        }
        if (matcher3.find()){
            System.out.println(str + " got repeated: " + matcher3.group(1) + " String must not contain any immediate repeated sequence of characters");
            return false;    
        }
        return true;
    }
public static void main(String[] args) {
    StringValidation sv = new StringValidation();
    String s2[] = {"1newAb", "A1DOALDO", "1234567AaAaAaAa", "123456ab3434", "$1214134abA", "invalid"};
    boolean b3;
    for(int i=0; i<s2.length; i++){
       b3 = s2[i].matches("^(?=.*\\p{Nd})(?=.*\\p{L})(?!.*(.{2,})\\1).{5,12}$");

       System.out.println(s2[i] +  "  "+ b3); // string "invalid" returning false (expected)
    }
    for (String str : s2) {
            if(sv.validateString(str))
                System.out.println(str + "String is Valid");
    }
}

Also I want "$1214134abA" this string to fail since it has $

Could you please supply a set of samples along with whether you want each item to pass/fail your regex? — Simon MᶜKenzie
– Simon MᶜKenzie, Commented Mar 14, 2013 at 5:22
am passing list of strings as examples and more samples could be: VԀअs1 (valid) Vd$s1 (invalid) Vdab1 (valid) — user1769790
– user1769790, Commented Mar 14, 2013 at 5:31
@user1769790 your first if condition is true if a match is found! — Naveed S
– Naveed S, Commented Mar 14, 2013 at 5:40

Naveed S · Accepted Answer · 2013-03-14 05:33:54Z

2

Pattern.compile("^(?=.*\\p{Nd})(?=.*\\p{L})").matcher("invalid").find() returns false as "invalid" does not contain a digit. Thus the if condition is evaluated to false and that block is skipped.

Use ^(?=[\\p{Nd}\\p{L}]*\\p{Nd})(?=[\\p{Nd}\\p{L}]*\\p{L}) to avoid characters other than letters and digits.

It will not accept $1214134abA as it contains $.

edited Mar 14, 2013 at 5:33

answered Mar 14, 2013 at 5:27

Naveed S

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2 Comments

user1769790 Over a year ago

just tried as is if(Pattern.compile("^(?=[\\p{Nd}\\p{L}]*\\p{Nd})(?=[\\p{Nd}\\p{L}]*\\p{L})").matcher(str).find()){ System.out.println(str + " String must consist of a mixture of letters and numerical digits only, with at least one of each"); } It returns invalid string for valid strings like: A1DOALDO, 1234567AaAaAaAa, 123456ab3434

Naveed S Over a year ago

@user1769790 add negation to the if condition. now it is true if a match is found!

Pshemo · Accepted Answer · 2013-03-14 05:41:44Z

2

It seems that you forgot to use negation in

if(matcher1.find()){ //Expecting
    ... 
    return false;
}

It should return false if it will not find match. Try with

if(!matcher1.find()){ //Expecting...

Also since you want to check if your entire string is build on letters and digits instead of .{5,12} at the end try [\\p{L}\\p{Nd}]{5,12} .

edited Mar 14, 2013 at 5:41

answered Mar 14, 2013 at 5:21

Pshemo

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2 Comments

user1769790 Over a year ago

that's right!! and am choosing Naveed's as answer and upvoting here.

user1769790 Over a year ago

Thank you! You know all my issues by now :)

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