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

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");

CodePudding user response：

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

CodePudding user response：

Use String.prototype.match() in help