Writing a Regex for Kuwait Mobile number in international format

Question

I need a regex to match following:

• total string length 12
• first four characters must be +965
• fifth character either 5, 6 or 9
• followed by 7 digits [0-9]
• nothing else allowed

Any help regarding this shall be highly appreciated.

Answer 1

Based on help extended by Pranav and Tim, the regex for kuwait mobile is +965[569]\d{7}$

working fine with simfatic forms. Thanx for the help.