how to write a regex that has substring match and exclude another substring

Question

I want to write a regex to evaluate 12 character strings, a sample string is a02016ab-B30, I want to find all strings that have 4 to 6 character as 016 and 10 to 11 character not as B3.

.{3}(061).{3}(?!B3) doesn't exclude string with more than 12 characters? how can I refine it?

The string is unachored and matches 9 chars. Should 061 be 016? — The fourth bird
– The fourth bird, Commented Jul 10, 2020 at 15:41

Wiktor Stribiżew · Accepted Answer · 2020-07-10 15:37:28Z

1

You may use

^.{3}061.{3}(?!B3).{3}$

Or, if you have 016 after the first three chars:

^.{3}016.{3}(?!B3).{3}$

See the regex demo.

Details

^ - start of string
.{3} - any three chars other than line break chars
061 - a substring
.{3} - any three chars other than line break chars
(?!B3) - B3 substring is not allowed at the current location
.{3} - any three chars other than line break chars
$ - end of string.

answered Jul 10, 2020 at 15:37

Wiktor Stribiżew

631k41 gold badges502 silver badges632 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Rock Over a year ago

Thank you very much! That was an easy fix!

Collectives™ on Stack Overflow

how to write a regex that has substring match and exclude another substring

1 Answer 1

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related