Regular Expressions 101

Pro

\ban ASCII word boundary

APPLE BANANAthe literal text APPLE BANANA (case sensitive)

Negative Lookahead(?!\s+CARROT\s+VEGETABLE\b)

\s+any whitespace character, repeated at least once

CARROTthe literal text CARROT (case sensitive)

\s+any whitespace character, repeated at least once

VEGETABLEthe literal text VEGETABLE (case sensitive)

\ban ASCII word boundary

Non-Capturing Group(?:\s+CARROT\b)?

?repeats the group contents below at most once:

\s+any whitespace character, repeated at least once

CARROTthe literal text CARROT (case sensitive)

\ban ASCII word boundary

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

Regular Expression

\bAPPLE BANANA(?!\s+CARROT\s+VEGETABLE\b)(?:\s+CARROT\b)?

New

APPLE BANANA CARROT FRUIT
APPLE BANANA VEGETABLE FRUIT
APPLE BANANA NOT FRUIT
APPLE BANANA CARROT 
APPLE BANANA CARROT FRUIT VEGETABLE

APPLE BANANA CARROT VEGETABLE FRUIT