Regular Expressions 101

Explanation

Pro

Positive Lookbehind(?<=by )

by the literal text by (case insensitive)

Group 1((\w+) (\w+))

Group 2(\w+)

\w+any word character, repeated at least once

the literal (32₁₀ / 40₈ / 20₁₆)

Group 3(\w+)

\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 4((\w+) (\w+))?

?repeats the group contents below at most once:

Group 5(\w+)

\w+any word character, repeated at least once

the literal (32₁₀ / 40₈ / 20₁₆)

Group 6(\w+)

\w+any word character, repeated at least once

Non-Capturing Group(?:\s*(?<=and ))

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

Positive Lookbehind(?<=and )

and the literal text and (case insensitive)

Group 7((\w+) (\w+))

Group 8(\w+)

\w+any word character, repeated at least once

the literal (32₁₀ / 40₈ / 20₁₆)

Group 9(\w+)

\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+))?(?:\s*(?<=and ))((\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