Regular Expressions 101

Pro

^start of line

Negative Lookahead(?!.*\bclouds\b)

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

\ban ASCII word boundary

cloudsthe literal text clouds (case sensitive)

\ban ASCII word boundary

Positive Lookahead(?=.*\bsun\b)

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

\ban ASCII word boundary

sunthe literal text sun (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.

26 tokens

Regular Expression

^(?!.*\bclouds\b)(?=.*\bsun\b).*$

New

The sun is yellow and the sky is blue
The sun is yellow and the clouds are white
The crayon is yellow and the clouds are white
There are many suns
I see one cloud in front of the sun
The sunshine is bright