Equivalent regex for this webApi PasswordValidator

Question

I'd like to validate the password before the form is submit using Regex, Id like to know what whats the equivalent regex for the following PasswordValidator settings:

        UserManager.PasswordValidator = new PasswordValidator
        {
            RequiredLength = 6,
            RequireNonLetterOrDigit = true,
            RequireDigit = false,
            RequireLowercase = true,
            RequireUppercase = true,
        };

im using the AngujarJS pattern validation. Example:

 <input type="password" class="form-control" name="inputPassword" ng-minlength="6" np-pattern="/^(?=.*[a-z])(?=.*[A-Z])(?=.*(_|[^\w])).+$/" ng-model="userData.Password" />
<p class="alert-danger" ng-show="userDetails.inputPassword.$error.pattern">The Password is invalid</p>

But it simply ignore it.

Thank you very much!

Update 1 with the help of accepted answer i come to the following regex ^(?=.[a-z])(?=.[A-Z])(?=.*(_|[^\w])).+$ and added the length validation as ng-minlength="6" for some reason the pattern validation doesnt work on IE9 where the validation prevent the user save, rendering it totally useless.

Update 2

By suggested by stribizhev, changing the any symbol regex to (?=.*[\W_]) fixed IE9 validation, so it works 100% in IE9, final code is

<input type="password" class="form-control" name="inputPassword" ng-minlength="6" ng-pattern="/^(?=.*[a-z])(?=.*[A-Z])(?=.*[\W_]).+$/" ng-model="userData.Password" />
<p class="alert-danger" ng-show="userDetails.inputPassword.$error.pattern || userDetails.inputPassword.$error.minlength">The Password is invalid</p>

thank you all very much

I would check this `^(?=.*[^a-zA-Z\d])(?=.*[a-z])(?=.*[A-Z]).{6}$` not sure if it is correct. — , Aug 31 '15 at 22:42
The non letter/digit needs to be better defined. Also, in total, the available/allowed characters should be better defined, like at least non-whitespace, 6 or more: `\S{6,}` — , Aug 31 '15 at 22:48
@montelof - Fyi: On your **update 2** - Just to be clear, `(?=.*[\W_])` is _exactly identical_ to `(?=.*(_|[^\w]))` in function. Any speed difference due to the alternation is _not_ noticeable in your context. And in no way affects backtracking whatsoever. As for `fixed IE9 validation`, that's not even relavent, or remotely possible !! — , Sep 01 '15 at 20:01
@sln I know its weird, using chrome it works either way, but in IE9 only the second one did it. I dont know if its something related to the pipe maybe. — montelof, Sep 02 '15 at 23:08
@montelof - `I dont know if its something related to the pipe maybe`. I'm pretty sure `pipes`/alternation was included when the first regular expression engine was designed. That would be a long time ago. Its probably something else at fault. I would be worried about the integrity of an engine that appears to have a problems with an alternation. I would separately test a piped expression both inside and outside a lookahead assertion. If it doesn't work inside a lookahead assertion, the engine integrity is in the _crapper_ !! — , Sep 09 '15 at 16:59

score 1 · Accepted Answer · edited May 23 '17 at 11:52

1

^(?=.*[!@#$&*])(?=.*[a-z])(?=.*[A-Z]).{6,}$

I found that answer on SO which will give you hint how to construct your own regex https://stackoverflow.com/a/5142164/2892208

edited May 23 '17 at 11:52

Community

1
1

answered Aug 31 '15 at 22:45

jgasiorowski

1,033
10
20

thank you the last comma is what i was missing it looks like this ^(?=.*[a-z])(?=.*[A-Z])(?=.*(_|[^\w])).{6,}+$ – montelof Aug 31 '15 at 22:54
1

I advise turning `(?=.*(_|[^\w]))` to `(?=.*[\W_])`. Less backtracking, quicker regex. Do you allow spaces in the password? – Wiktor Stribiżew Aug 31 '15 at 22:59
the expression I used works only on chrome but not for length validation, for that i had to use the ng-minlength validation. – montelof Sep 01 '15 at 01:22
thank you stribizhev, your solution fixed the validation in IE9. – montelof Sep 01 '15 at 12:38

Equivalent regex for this webApi PasswordValidator

1 Answers1