Regular Expressions 101

^start of line

Group 1((?!car).)*

*repeats the group contents below any number of times:

Negative Lookahead(?!car)

carthe literal text car (case sensitive)

.any character (except for line terminators)

bookthe literal text book (case sensitive)

.*any character (except for line terminators), repeated any number of times

$end of line

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.

Search reference

Regular Expression

^((?!car).)*book.*$

New

this car is a book
this is a book
book car