Regular Expressions 101

Pro

^start of line

Positive Lookahead(?=.*\bgood foo\b)

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

\ban ASCII word boundary

good foothe literal text good foo (case sensitive)

\ban ASCII word boundary

Negative Lookahead(?!.*\bgood koo\b)

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

\ban ASCII word boundary

good koothe literal text good koo (case sensitive)

\ban ASCII word boundary

.*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.

25 tokens

^(?=.*\bgood foo\b)(?!.*\bgood koo\b).*$

New

some text good foo and some text and good koo 
good foo and some text (no indication of koo)