Regex pattern to match at least 1 number and 1 cha

Question

I have a regex

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

this just allows only alphanumerics but also if I insert only number(s) or only character(s) then also it accepts it. I want it to work like the field should accept only alphanumeric values but the value must contain at least both 1 character and 1 number.

Answer 1

While the accepted answer is correct, I find this regex a lot easier to read:

REGEX = "([A-Za-z]+[0-9]|[0-9]+[A-Za-z])[A-Za-z0-9]*"

Answer 2

This RE will do:

/^(?:[0-9]+[a-z]|[a-z]+[0-9])[a-z0-9]*$/i

Explanation of RE:

• Match either of the following:
  1. At least one number, then one letter or
  2. At least one letter, then one number plus
• Any remaining numbers and letters
  
  
• (?:...) creates an unreferenced group
• /i is the ignore-case flag, so that a-z == a-zA-Z.