Regular Expressions 101

\ban ASCII word boundary

Positive Lookahead(?=\w*(\w)\w*\1)

\w*any word character, repeated any number of times

Group 1(\w)

\wany word character

\w*any word character, repeated any number of times

\1the text saved by group 1

\w+any word character, repeated at least once

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(?=\w*(\w)\w*\1)\w+

New

abab sbs abc ffuuu qwerty uii onnl ghj