Regular Expressions 101

\ban ASCII word boundary

Group 1([^;]+)

Negated Character Class[^;]+

+matches at least one character outside the set below:

;the literal ; (59₁₀ / 73₈ / 3B₁₆)

Negative Lookahead(?!.*\1)

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

\1the text saved by group 1

;the literal ; (59₁₀ / 73₈ / 3B₁₆)

Global pattern flags

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

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

\b([^;]+)(?!.*\1);

Test String
New

C:\Users\user\Desktop\TESTING\path1;C:\Users\user\Desktop\TESTING\path5;C:\Users\user\Desktop\TESTING\path1;C:\Users\user\Desktop\TESTING\path6;C:\Users\user\Desktop\TESTING\path1;C:\Users\user\Desktop\TESTING\path3;C:\Users\user\Desktop\TESTING\path1;C:\Users\user\Desktop\TESTING\path3;

Regular Expression

Test StringNew

SubstitutionProcessing...

Test String
New

Substitution
Processing...