Regular expression which 3 characters or more, min one minus, max 3 numbers

Question

I need the following regular expression:

• Must have 3 alphabetic caracters or more.
• Must have one lower case or more
• Can have 0 to 3 numbers (max 3) 0-9 (123 for example is 3 numbers)
• Must have exactly one ú (One ú exactly)
• Must finish with one of the following characters : # } .
• Must have min 9 chars, max 12

I try the following regular expression:

/^(?=.*[A-Za-z]{3,})(?=.*[a-z]{1,})(?=.*[0-9]\d{0,3})(u{1})[A-Za-z0-9\d]{9,12}$/

One example valid: aA2ca13ú}

Answer 1

You can use this regex that should meet your requirements,

^(?=[^A-Za-z]*(?:[A-Za-z]+[^A-Za-z]*){3,})(?=\D*\d?\D*\d?\D*\d?\D*$)(?=[^ú]*ú[^ú]*$)[úa-zA-Z\d-]{8,11}[#}.]$

Demo

Let me know if any of your case fails.