regular expression with prefix

I am trying to write a regular expression for validating characters

13 characters and the first 5 starts must be ABCDE

for example

• ABCDE12312345 – valid
• ABCDE14512345 – valid
• 1234145123454 – NOT valid because not start with ABCDE // first five charaters must be ABCED and in total 13 characters

I am tried google but no luck

>Solution :

how about that:

r"^ABCDE.{8}$"

• ^ start of string
• followed by ABCDE
• .{8} .` matches anything exact 8 times to get you to a length of 13
• $ end of string

see here