Regular expression is required to add a custom validation method in jquery

Question

I want to do validation of a password field on a login form. The requirement for the password is that the password should be combination of alphabet and numbers. I write a new validation function to fulfil above requirement and added it to jQuery using validator.addmethod(). The function code is as follows

$.validator.addMethod('alphanum', function (value) {
    return /^[a-zA-Z 0-9]+$/.test(value);
}, 'Password should be Alphanumeric.');

Problem is this function is not working properly i.e. it accepts alphabetic password (like abcdeSD) and numerical password (like 4255345) and dot give error message for such inputs.

so is there anything wrong in my code?
is the written regular expression is wrong and if yes then what will be the correct reg expression?

Hi Gumbo! My aim to validate password is to avoid sql injection because of that I am validating password. — Param-Ganak
– Param-Ganak, Commented Feb 15, 2010 at 10:06
If SQL injection is your only reason for validating then this is not the right way to do it. It looks like you're trying to encourage people to increase their password strength (but you allow passwords of length 1?). — Mark Byers
– Mark Byers, Commented Feb 15, 2010 at 10:10
Thanks Mark! for your comment but I am not allowing passwords of length 1. I have made the validation for password length using maxlength and minlength. — Param-Ganak
– Param-Ganak, Commented Feb 15, 2010 at 11:05

Mark Byers · Accepted Answer · 2010-02-15 09:53:51Z

2

Use negative lookaheads to disallow what you don't want:

^(?![a-zA-Z]+$)(?![0-9]+$)[a-zA-Z 0-9]+$

answered Feb 15, 2010 at 9:53

Mark Byers

844k202 gold badges1.6k silver badges1.5k bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Param-Ganak Over a year ago

Thank You Mark! The regular expression you have given is working perfect man. thank you very much

Anurag · Accepted Answer · 2010-02-15 10:08:52Z

0

Password must contain only alphabets and digits

/^[a-zA-Z0-9]+$/

It must contain alphabet(s)

/[a-zA-Z]+/

It must contain digit(s)

/[0-9]+/

And'ing these

/^[a-zA-Z0-9]+$/.test(value) && /[a-zA-Z]+/.test(value) && /[0-9]+/.test(value)

answered Feb 15, 2010 at 10:08

Anurag

142k37 gold badges223 silver badges262 bronze badges

Comments

Bill Tür stands with Ukraine · Accepted Answer · 2017-09-19 07:10:50Z

0

Use this expression for password for javascript:

/((?=.*\d)(?=.*[a-z])(?=.*[A-Z])(?=.*[@#$%_!]).{8,8})/

You can add the any special characters in the expression.

Manually add the characters for in [@#$%_!] inside.

edited Sep 19, 2017 at 7:10

Bill Tür stands with Ukraine

3,54730 gold badges42 silver badges52 bronze badges

answered Sep 19, 2017 at 6:03

Dhanasekaran

37 bronze badges

Collectives™ on Stack Overflow

Regular expression is required to add a custom validation method in jquery

3 Answers 3

1 Comment

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

1 Comment

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related