Regular expression for password

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2.67/5 (2 votes)

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Dear All,

Regular expression for validating the password.
Requirement :
1) Minimum length --> 8 characters
2) Maximum length --> 50 characters
3) The first 8 characters must contain atleast 1-Lowercase, 1-Uppercase, 1-numeric, 1- Special characters.(Note : Allowed special characters are ~ ! * - _ @ # $ ^ & | > < .

Thank you and best regards in advance
Nagaraj.N.M.

Posted 12-Apr-13 16:56pm

NAGARAJ N MACHAKNUR

Updated 12-Apr-13 17:08pm

v2

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Sergey Alexandrovich Kryukov 12-Apr-13 23:46pm

Not very good requirements: don't limit maximum length (why?!), don't limit what you call "special characters" (they are not "special", who told you they are? :-).

What did you try so far?

—SA

2 solutions

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sainadh.chintha · Answer 1 · 2013-04-12T18:20:00

Solution 2

hi,
try this..hope this helps you..

C#

function validate() {
var dd = document.getElementById("txtbox");
var express = /^(?=.*\d)(?=.*[a-z])(?=.*[A-Z]).{8,50}$/;
if (!express.test(dd.value)) {
alert("You must enter secure password");
}
}

Posted 12-Apr-13 18:20pm

sainadh.chintha

Sergey Alexandrovich Kryukov · Answer 2 · 2013-04-12T17:53:00

Here is the advice: remove #2, remove limitation for "special characters", remove even worse requirement for "first 8". Those requirements only make the life of the owner of the password harder but only reduce its strength. (And just one warning in advance: I'm not going to listen to your argument the the requirements for the password are already given to you; in this case I think you should ask the person who gave your this spec, of let her/him ask use instead of you.)

Now, I would not use Regex. Simply right code (a Boolean predicate method accepting a string as input parameter) first checking the maximum length and then counting the characters of each class.

Regex should be used when it is really beneficial, not in all cases when string validation is needed. You can find out unlimited number of cases which cannot be validated using Regex in principle, or the solution would not be maintainable.

—SA