Regular Expressions 101

Pro

Negative Lookbehind(?<!\bwhether or )

\ban ASCII word boundary

whether or the literal text whether or (case sensitive)

Negative Lookbehind(?<!\bwhether or not )

\ban ASCII word boundary

whether or not the literal text whether or not (case sensitive)

Non-Capturing Group(?:\bnot )?

?repeats the group contents below at most once:

\ban ASCII word boundary

not the literal text not (case sensitive)

applethe literal text apple (case sensitive)

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

Detailed match information will be displayed here automatically.

25 tokens

(?<!\bwhether or )(?<!\bwhether or not )(?:\bnot )?apple

New

whether or not apple
apple
not apple

whether or not apple
apple
not apple