Regular Expressions 101

Explanation

Pro

^start of line

Group 1(Test|Sample)

1st AlternativeTest

Testthe literal text Test (case sensitive)

2nd AlternativeSample

Samplethe literal text Sample (case sensitive)

Negative Lookahead(?!.*(Hello|World))

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

Group 2(Hello|World)

1st AlternativeHello

Hellothe literal text Hello (case sensitive)

2nd AlternativeWorld

Worldthe literal text World (case sensitive)

Positive Lookahead(?=$|.*(Stuff|Other))

1st Alternative$

$end of line

2nd Alternative.*(Stuff|Other)

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

Group 3(Stuff|Other)

1st AlternativeStuff

Stuffthe literal text Stuff (case sensitive)

2nd AlternativeOther

Otherthe literal text Other (case sensitive)

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

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

Match Information

Detailed match information will be displayed here automatically.

Quick Reference

25 tokens

Regular Expression

^(Test|Sample)(?!.*(Hello|World))(?=$|.*(Stuff|Other)).*

Test
Test Good
Sample Stuff 
Test Hello 
Sample World 
Test Hello Stuff 
Sample Good World
Test Other
Test Other Stuff 
Sample Other World
Test Other Stuff Other
The following strings would be

Substitution

Test
Test Good
Sample Stuff 
Test Hello 
Sample World 
Test Hello Stuff 
Sample Good World
Test Other
Test Other Stuff 
Sample Other World
Test Other Stuff Other
The following strings would be