Regular Expression to exclude set of Keywords

Question

I want an expression that will fail when it encounters words such as \"boon.ini\" and \"http\". The goal would be to take this expression and be able to construct for any se

Answer 1

An alternative expression that could be used:

^(?!.*IgnoreMe).*$

^ = indicates start of line
$ = indicates the end of the line
(?! Expression) = indicates zero width look ahead negative match on the expression

The ^ at the front is needed, otherwise when evaluated the negative look ahead could start from somewhere within/beyond the 'IgnoreMe' text - and make a match where you don't want it too.

e.g. If you use the regex:

(?!.*IgnoreMe).*$

With the input "Hello IgnoreMe Please", this will will result in something like: "gnoreMe Please" as the negative look ahead finds that there is no complete string 'IgnoreMe' after the 'I'.