Regex pattern to match at least 1 number and 1 character in a string

Question

I have a regex

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

this just allows only alphanumerics but also if I insert only number(s) or only

Answer 1

And an idea with a negative check.

/^(?!\d*$|[a-z]*$)[a-z\d]+$/i

• ^(?! at start look ahead if string does not
• \d*$ contain only digits | or
• [a-z]*$ contain only letters
• [a-z\d]+$ matches one or more letters or digits until $ end.

Have a look at this regex101 demo

(the i flag turns on caseless matching: a-z matches a-zA-Z)