How to check is string has both letter and number in javascript

Question

I have string "JHJK34GHJ456HJK". How to check if this string has both letter and number, doesn't have whitespace, doesn't have special characters like # - /, If has only letter or only number didn't match.

I try with regex below, result is true if string is only number or letter.

const queryLetterNumber = /^[A-Za-z0-9]*$/.test("JHJK34GHJ456HJK");

What did you try? Where are you stuck? Stack Overflow is not a place where you can just "dump" a problem and expect someone to write everything for you. — Cerbrus, Sep 14 '22 at 12:38
[Regex for password must contain at least eight characters, at least one number and both lower and uppercase letters and special characters](https://stackoverflow.com/questions/19605150/regex-for-password-must-contain-at-least-eight-characters-at-least-one-number-a). Use the first one in the accepted answer and just remove the `{8,}` part. (Or replace it with whatever you need the length to be.) — Ivar, Sep 14 '22 at 12:44
const string = "QW23RLRK45r"; const chek = /^(?=.*[0-9])(?=.*[a-z])(?=.*[A-Z])(?=.*\W)(?!.* ).{4,16}$/.test(le); It is false. — Ismeet, Sep 14 '22 at 12:52
The regex for `Contains` is: `/^(?=.*[A-Za-z])/` for letters, you figure out for numbers. — Poul Bak, Sep 14 '22 at 12:52
@Ismeet That is not the first regex of the accepted answer. I was referring to `"^(?=.*[A-Za-z])(?=.*\d)[A-Za-z\d]{8,}$"`. — Ivar, Sep 14 '22 at 12:55
const le = "QW23RLRK45"; const q = /(^.*[A-Za-z])(^.*[0-9])/.test(le); It is false. — Ismeet, Sep 14 '22 at 12:55

score 1 · Accepted Answer · answered Sep 15 '22 at 01:02

const input= [
  'JHJK34GHJ456HJK',
  'JHJKAAGHJAAAHJK',
  '123456789012345',
  'JHJK34 space JK',
  'JHJK34$dollarJK'
];
const regex = /^(?=.*[0-9])(?=.*[A-Za-z])[A-Za-z0-9]+$/;
input.forEach(str => {
  console.log(str + ' => ' + regex.test(str));
});

Output:

JHJK34GHJ456HJK => true
JHJKAAGHJAAAHJK => false
123456789012345 => false
JHJK34 space JK => false
JHJK34$dollarJK => false

Explanation:

^ - anchor at beginning
(?=.*[0-9]) - positive lookahead expecting at least one digit
(?=.*[A-Za-z]) - positive lookahead expecting at least one alpha char
[A-Za-z0-9]+ - expect 1+ alphanumeric chars
$ - anchor at end

score -1 · Answer 2 · edited Sep 18 '22 at 09:57

-1

you should use a regular expression to check for alphanumeric content in the string

/^[a-z0-9]+$/i

The above is a sample that checks for a-z and numbers from 0-9. however, review other options as given here

edited Sep 18 '22 at 09:57

Saravanan

7,637
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answered Sep 14 '22 at 12:40

Nikita

16
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you should use a regex for this – Saravanan Sep 18 '22 at 09:54

How to check is string has both letter and number in javascript

2 Answers2