Regular Expressions 101

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.

Search reference

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

Regular Expression

Extraction