REGEX password must contain letters a-zA-Z and at least one digit 0-9

Question

User2606139 posted
I need help how to make regex to validate password if it contains at least one character [a-zA-Z] and at least one digit [0-9]??

I look for any digit .*[0-9].* and for any character .*[a-zA-Z]+.* but I don't know how to connect them to search for at least one digit in any position and one character in any position (any appearance of)

Regards,

Answer 1

User-873196719 posted

This isn't easily done with 1 regex.

You need one regex to test for a letter and another to test for a digit.

If you say the password must start with a letter, then the regex is simple:  @"^[A-Za-z]+\d+.*$"

Answer 2

User-831632110 posted

How about this...




^(?=.*\d)(?=.*[a-zA-Z]).{4,8}$
This will check for text string to have atleast one Numeric and one Character and the  length of text string to be 
between 4 to 8 characters.....Try this out...Njoy!

Answer 3

User-873196719 posted
Cool!!

I didn't realize that the RegEx engine did look ahead.

Answer 4

User2606139 posted

That is great However unfortunatly it do not accept strings like "mypass1" because there is no letter after digit. it is accepting only "my1pass" or "1mypass".

What I need is to do exactly that what do your regex but without important order of appearance

Moreover (i don't know why) but it do not accept string where is more digits then characters like : "35463pas". But it is not a big problem...

Is it possible to make your regex that will ignore the order of appearance?

Answer 5

User2606139 posted
I FOUND THAT!!! Great thanks for akchamarthy

It was easy;) I googled your regex and I found some similar another versions of that I have combined them :) and I got exactly that what I need without important order of appearance :

Actual Regex is : ^.*(?=.{4,10})(?=.*\d)(?=.*[a-zA-Z]).*$

1) Search for at least one digit in any position
2) Search for at least one upper or lower case in any position
3) Enforce password to consist of 4-10 characters

Now it's exactly what I need;)

THANKS akchamarthy again:)!! I've just added ".*" twice and changed string leanght controlelr??(can it be called like that?) :)

Best Regards

Answer 6

User-831632110 posted
Cool...Glad i was of some help....Njoy!

Answer 7

User-916962509 posted

I know this is a nearly-3-year-old post so sorry to post a reply. 

Just wanted to say thank you for posting this regular expression. I've spent most of today googling for it, and finally typed just the right thing into Google to find this page :)

I did modify it just slightly; because your regex would allow special characters and space characters. I wanted to validate a username with the rules 1. must be at least six characters; 2. must contain only letters or numbers; 3. must contain at least one letter.

To solve my problem, I adapted your regex slightly into:

 

 ^.*(?=.{6,})(?=.*[a-zA-Z])[a-zA-Z0-9]+$

 

Thanks again!

Answer 8

User820639650 posted

A huge THANX to both akchamarthy and Dealie for both your examples were exactly what I was looking for to come up with a quick win on a late friday evening issue - I know very little about RegEx, and needed to craft something out of thin air. Wouldn't be able to do it without these posts. Still good after 5 years!!

You guys are champs! I owe you a lot!

Answer 9

User-1312360597 posted

Old thread, I know - I am looking at a very similar regex, and I'm almost there, but need some help finishing it off. Here's what I need:

1) 6-10 characters

2) At least one alpha AND one number

3) The following special chars are allowed (0 or more): !@#$%

Here's what I have:

^.*(?=.{6,10})(?=.*[a-zA-Z])(?=.*\d)[a-zA-Z0-9!@#$%]+$

It works on all my test cases, except it allows "a1234567890", "testIt!0987", and "1abcdefghijk", none of which should be allowed, since they contain more than 10 chars.

Any ideas?

Answer 10

User-196574331 posted

Late, but as the topic is well referenced it deserves an answer in case someone needs the same

 

1) 6-10 characters

2) At least one alpha AND one number

3) The following special chars are allowed (0 or more): !@#$%

based on akchamarthy's regexp

^(?=.*\d+)(?=.*[a-zA-Z])[0-9a-zA-Z!@#$%]{6,10}$

to explain it, consider it as 3 individual parts

(?=.*\d+)  ===> the chain must contain a digit

AND

(?=.*[a-zA-Z])  ===> the chain must contain an alpha

AND

[0-9a-zA-Z!@#$%]{6,10}  ===> the chain can only contain digit, alpha and the special characters "!@#$%" with a size limit of {6,10}

Glad I found this topic BTW, because I didn't know either that something like lookahead ('?=' ) existed.

Answer 11

User1518303729 posted

hi,

i need a code for mail id shoud contain atleast 6 chareters and user id should not contain number values, and no empty spaces. and password length shud be 6 to 8 charecters and password contain one special charecter and atleast one digit and atleast one capital letter. please give me reply with answer

Answer 12

User1207564159 posted

Simple solution to check for password containing at least one letter, at least one digit and no spaces:

\S*(\S*([a-zA-Z]\S*[0-9])|([0-9]\S*[a-zA-Z]))\S*

Answer 13

User1988957019 posted

Hi All,We have a requirement asking for atleast 3 out of 4 variables(for Password). Variables are:

1. small Letters[a-z]

2. Capital letters[A-Z]

3. digit[0-9]

4. Special Characters(Except Space)

5. Atleast 7 characters

I tried the below expression(tried with 3 of the above variables):

^(.*[0-9]+.*[a-z]+.*[A-Z]+.*)|(.*[0-9]+.*[A-Z]+.*[a-z]+.*)|(.*[a-z]+.*[0-9]+.*[A-Z]+.*)|(.*[a-z]+.*[A-Z]+.*[0-9]+.*)|(.*[A-Z]+.*[a-z]+.*[0-9]+.*)|(.*[A-Z]+.*[0-9]+.*[a-z]+.*)$ and this is working but as soon as I add the condition of minimum of 7 characters it throws an "Missing operand to apache.org.regexp" for below expression.

^(?.={7,})(.*[0-9]+.*[a-z]+.*[A-Z]+.*)|(.*[0-9]+.*[A-Z]+.*[a-z]+.*)|(.*[a-z]+.*[0-9]+.*[A-Z]+.*)|(.*[a-z]+.*[A-Z]+.*[0-9]+.*)|(.*[A-Z]+.*[a-z]+.*[0-9]+.*)|(.*[A-Z]+.*[0-9]+.*[a-z]+.*)$
Request you all to please guide as what I am doing wrong.

Thanks,
Rohit