Regular Expressions 101

Explanation

Pro

\ban ASCII word boundary

Group 1(.+)

.+any character (except for line terminators), repeated at least once

the literal (32₁₀ / 40₈ / 20₁₆)

\ban ASCII word boundary

Positive Lookahead(?=.*\b\1)

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

\ban ASCII word boundary

\1the text saved by group 1

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

\b(.+) \b(?=.*\b\1)

New

Mike Tyson 1. Street 1234 Vietnam ML(1234/97632) Mike Tyson 1234 1. Street Vietnam ML(12534/97632)

Mike Tyson 1. Street 1234 Vietnam ML(1234/97632) Mike Tyson 1234 1. Street Vietnam ML(12534/97632)