Regular Expressions 101

Explanation

Pro

Positive Lookbehind(?<=by )

by the literal text by (case insensitive)

Group 1(\w+ \w+)

\w+any word character, repeated at least once

the literal (32₁₀ / 40₈ / 20₁₆)

\w+any word character, repeated at least once

Non-Capturing Group(?:,\s*)?

?repeats the group contents below at most once:

,the literal , (44₁₀ / 54₈ / 2C₁₆)

\s*any whitespace character, repeated any number of times

Group 2(\w+ \w+)?

?repeats the group contents below at most once:

\w+any word character, repeated at least once

the literal (32₁₀ / 40₈ / 20₁₆)

\w+any word character, repeated at least once

Non-Capturing Group(?:\sand\s)?

?repeats the group contents below at most once:

\sany whitespace character

andthe literal text and (case insensitive)

\sany whitespace character

Group 3(\w+ \w+)?

?repeats the group contents below at most once:

\w+any word character, repeated at least once

the literal (32₁₀ / 40₈ / 20₁₆)

\w+any word character, repeated at least once

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

i modifier: insensitive. Matches without distinguishing uppercase and lowercase letters

Detailed match information will be displayed here automatically.

25 tokens

(?<=by )(\w+ \w+)(?:,\s*)?(\w+ \w+)?(?:\sand\s)?(\w+ \w+)?

New

By Person One, Person Two and Person Three
By Person One, Person Two
By Person One
By Person Two and Person Three

By Person One, Person Two and Person Three
By Person One, Person Two
By Person One
By Person Two and Person Three