Regular Expressions 101

Explanation

Pro

Group 1(\S+)

\S+any non-whitespace character, repeated at least once

, the literal text ,

Group 2(\S+)

\S+any non-whitespace character, repeated at least once

Group 3(.*(?!,))

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

Negative Lookahead(?!,)

,the literal , (44₁₀ / 54₈ / 2C₁₆)

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

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

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

Match Information

Detailed match information will be displayed here automatically.

Quick Reference

25 tokens

Regular Expression

(\S+), (\S+)(.*(?!,)).*?\n

New

lastname1, firstname1 middlename1
lastname1, firstname1 middlename1 lastname2, firstname2 middlename2
lastname1, firstname1
lastname1, firstname1 lastname2, firstname2
lastname1, firstname1 lastname2, firstname2

Substitution

lastname1, firstname1 middlename1
lastname1, firstname1 middlename1 lastname2, firstname2 middlename2
lastname1, firstname1
lastname1, firstname1 lastname2, firstname2
lastname1, firstname1 lastname2, firstname2