Mount Regex to validate password

Question

Mount Regex to validate password

Asked 9 years, 1 month ago

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2

someone would know to set up a regex to validate numerical and alphabetic sequences of at least 4 digits, like : 1111/1234/abcd/4321/dcba?

Do you want to validate whether they are sequences or the same? I don’t quite understand.

– Randrade

2015/10/22 at 13:40
I want to validate both, for example, if the guy writes "1111", I can not authorize this password because they are equal digits, if it is "1234" or "abcd" I can not, I do not know to use regex, I had done by values of an array, but saw that in good practice the ideal is to use regex

– Victor Siqueira

2015/10/22 at 13:54

3 answers

6

Minimum 4 characters, at least 1 letter and 1 number:

"^(?=.*[A-Za-z])(?=.*\d)[A-Za-z\d]{4,}$"

guy tried it here and it didn’t work very well, I found one that worked a little better "^(?=.\d)(?=.[a-za-Z])(?!. *[ W_x7B-xff]). {4,15}$"

– Victor Siqueira

2015/10/22 at 18:29
Okay, if you found one that fits better, great, the idea is you can solve your problem. Hug.

– guiandmag

2015/10/22 at 18:34

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by Laerte • **22,243** points · Answer 1 · 2015-10-22T13:44:00+00:00

If you want to validate if the password has 4 characters containing letters or numbers only. You can use this Regex:

^[^\W_]{4}$

If you want to test, I recommend this site: https://regex101.com/

by Álvaro Fonteles • 1 point · Answer 2 · 2017-02-24T23:04:33+00:00


private string getRegex()
    {
        string regex = "^.*(?=.{" + this.TamanhoMinimo.ToString() + ","+this.TamanhoMaximo.ToString()+"})";


        if (SenhaForte)
        {
            regex += "(?=.*[0-9])(?=.*[a-z])(?=.*[A-Z])";
            if (this.CaracterEspecial)
            {
                regex += "(?=.*[@#$%^&+=])";
            }
        }
        else
        {
            regex += "(?=.*[a-zA-Z0-9@#$%^&+=])";
        }

        regex += ".*$";

        return regex;
    }

//Letras maiúsculas, minusculas, caracteres especiais (@#$%^&+=) e numeros.