Regular Expressions 101

Pro

Positive Lookahead(?=.*youtube)

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

youtubethe literal text youtube (case sensitive)

Positive Lookahead(?=.*cat)

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

catthe literal text cat (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

Regular Expression

(?=.*youtube)(?=.*cat)

New

This lookahead search is case sensitive.
This this have cat in it?
Does this make a match for Youtube?
What about this youtube and CAT?
What about cat and YOUTUBE?
Here is youtube and cat

Extraction

This lookahead search is case sensitive.
This this have cat in it?
Does this make a match for Youtube?
What about this youtube and CAT?
What about cat and YOUTUBE?
Here is youtube and cat