Regular Expressions 101

^start of string

Negative Lookahead(?!(.(..)+)\1*$)

Group 1(.(..)+)

.any character (except for line terminators)

Group 2(..)+

+repeats the group contents below at least once:

.any character (except for line terminators)

\1*the text saved by group 1, repeated any number of times

$end of string, or before its final line terminator

Detailed match information will be displayed here automatically.

25 tokens

Regular Expression

^(?!(.(..)+)\1*$)

New

x
xx
xxxx
xxxxxxxx
xxxxxxxxxxxxxxxx
xx…(32)…xx
xx…(64)…xx
xx…(128)…xx
xx…(256)…xx
xx…(512)…xx
xx…(1024)…xx