Home
Tester
Reference
About
Pattern
(\b\w+\b)(?:(?=.*?\b\1\b)|(?<=\b\1\b.*?\1))
Input
A
B
C
a
b
B
A B C a b B
Options
Ignore Case
Ignore Whitespace
Explicit Capture
Culture Invariant
Singleline
Multiline
Right To Left
ECMA Script
Start from position:
Max matches to find:
Replacement
Replace matches with...
Click the
context
tab to see replacements.
Regex Info
Table
Context
Split List
5
matches found in about
12
milliseconds.
Show Permalink
Permalink
Index
Position
Matched String
$1
0
0
A
A
1
2
B
B
2
6
a
a
3
8
b
b
4
10
B
B
A
B
C
a
b
B
empty string
A
whitespace
B
C
a
whitespace
b
whitespace
B
empty string
Regex Storm © 2010 - 2024 Will Boyd
Twitter: