Regular Expressions 101

Pro

^start of line

Group 1(apple|bat|car)

1st Alternativeapple

applethe literal text apple (case insensitive)

2nd Alternativebat

batthe literal text bat (case insensitive)

3rd Alternativecar

carthe literal text car (case insensitive)

, the literal text ,

Negative Lookahead(?!\1)

\1the text saved by group 1

Group 2(apple|bat|car)

1st Alternativeapple

applethe literal text apple (case insensitive)

2nd Alternativebat

batthe literal text bat (case insensitive)

3rd Alternativecar

carthe literal text car (case insensitive)

, the literal text ,

Negative Lookahead(?!\1|\2)

1st Alternative\1

\1the text saved by group 1

2nd Alternative\2

\2the text saved by group 2

Group 3(apple|bat|car)

1st Alternativeapple

applethe literal text apple (case insensitive)

2nd Alternativebat

batthe literal text bat (case insensitive)

3rd Alternativecar

carthe literal text car (case insensitive)

$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

i modifier: insensitive. Matches without distinguishing uppercase and lowercase letters

Detailed match information will be displayed here automatically.

25 tokens

Regular Expression

^(apple|bat|car), (?!\1)(apple|bat|car), (?!\1|\2)(apple|bat|car)$

New

apple, bat, car
apple, car, bat
bat, apple, car
car, bat, apple

FAILS

apple, bat, car, d
d, apple, bat, car
apple, bat, d, car
apple, apple, car
apple, apple, apple

Extraction

apple, bat, car
apple, car, bat
bat, apple, car
car, bat, apple

FAILS

apple, bat, car, d
d, apple, bat, car
apple, bat, d, car
apple, apple, car
apple, apple, apple