Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
I’m trying to find a halfway decent regex for a string exactly 8 characters long. Those 8 characters should be comprised of a’s followed by b’s.
Another way of putting this would be a{n}b{8-n} where n=0…8
Example Matching Strings:
aaaaaaaa
abbbbbbb
aaaabbbb
bbbbbbbb
Example Non-Matching Strings:
bbbbaaaa
aaaabaaa
There are many ways to do it. Here’s another alternative:
Of course you can switch around what’s in the lookahead: