Please enable JavaScript to use regex101
/
^
r
e
g
e
x
[
\
-
_
]
?
1
0
1
$
/
i
Reg
ular
Ex
pressions
101
Upgrade to Pro
Enterprise
Regular Expression
/
^([abcd])((?!\1)[abcd])?((?!\1|\2)[abcd])?((?!\1|\2|\3)[abcd])?$
/
gm
Input 1
1
New
abcd abc aaa ab a abb abcb dbca dbda bdba cbad
Extraction
abcd abc aaa ab a abb abcb dbca dbda bdba cbad