Regular Expressions 101

\ban ASCII word boundary

Group 1(\d+)

\d+a digit, repeated at least once

\|the literal | (124₁₀ / 174₈ / 7C₁₆)

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

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

\ban ASCII word boundary

\1the text saved by group 1

\ban ASCII word boundary

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.

Search reference

Regular Expression

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

New

0612|0613|061|0612|0612
0211|0612|021|0212|0211|0211
0111|0111
0511|0512|0511|0511|0521|0512|0511