Regular Expressions 101

Pro

Group 1([^\n,]++)

Negated Character Class[^\n,]++

++matches at least one character outside the set below:

\na line-feed (newline) character (ASCII 10)

,the literal , (44₁₀ / 54₈ / 2C₁₆)

Positive Lookahead(?=.*,([^\n,@]+$))

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

,the literal , (44₁₀ / 54₈ / 2C₁₆)

Group 2([^\n,@]+$)

Negated Character Class[^\n,@]+

+matches at least one character outside the set below:

\na line-feed (newline) character (ASCII 10)

,the literal , (44₁₀ / 54₈ / 2C₁₆)

@the literal @ (64₁₀ / 100₈ / 40₁₆)

$end of line

,the literal , (44₁₀ / 54₈ / 2C₁₆)

Non-Capturing Group(?:(?1)(?:\n|$))?

?repeats the group contents below at most once:

(?1)calls group 1 as a subroutine

Non-Capturing Group(?:\n|$)

1st Alternative\n

\na line-feed (newline) character (ASCII 10)

2nd Alternative$

$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

Regular Expression

([^\n,]++)(?=.*,([^\n,@]+$)),(?:(?1)(?:\n|$))?

New

johnsmith1@gmail.com,johnsmith2@gmail.com,johnsmith3@gmail.com,John Smith
taylorsmith@gmail.com,Taylor Smith
jacksmith1@gmail.com,jacksmith@gmail.com,Jack Smith

Extraction

johnsmith1@gmail.com,johnsmith2@gmail.com,johnsmith3@gmail.com,John Smith
taylorsmith@gmail.com,Taylor Smith
jacksmith1@gmail.com,jacksmith@gmail.com,Jack Smith