Regex for an alphanumeric of 8 character

Question

I want a regex that matches this where A is alphanumeric. first four digits are fixed. 7PTCAAAA

Please help me

Examples:

7PTC69RT 7PTC67KM 7PTC689F

Answer 1

7PTC[a-zA-Z0-9]{4}

1. 7PTC matches the characters 7PTC literally (case sensitive)

2. {4} Quantifier — Matches exactly 4 times

Try this here