Regex for a promo code that has the following rules

I need to build a regex that have the following:

Rules to be applied:

• exactly 14 characters
• only letters (latin characters) and numbers
• at least 3 letters

Regex still confuses me so I am struggling to get the correct output. I want to use it with swift and swiftui in an app I am making

(?=(.*[a-zA-Z]){3,}([0-9]){0,}){14,14}$

I tried this. But I know it is not the way

>Solution :

You need to use

^(?=(?:[0-9]*[a-zA-Z]){3})[a-zA-Z0-9]{14}$

Details

• ^ – start of string
• (?=(?:[0-9]*[a-zA-Z]){3}) – at least three repeations of a letter after any zero or more digits sequence required
• [a-zA-Z0-9]{14} – fourteen letters/digits
• $ – end of string.

See the regex demo.