Regular Expressions 101

^start of line

Negative Lookahead(?!(\S)\1+$)

Group 1(\S)

\Sany non-whitespace character

\1+the text saved by group 1, repeated at least once

$end of line

Negated Character Class[^\w\s]*

*matches any number of characters outside the set below:

\wany word character

\sany whitespace character

\wany word character

\S*any non-whitespace character, repeated any number of times

$end of line

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.

26 tokens

Regular Expression

^(?!(\S)\1+$)[^\w\s]*\w\S*$

New

11111111
1111811111
rrrrrrrr
rrrrrrrrrr5
11111111%
%$!@$!@@@@
%%%%%%%%%1
a
%%%%%%% %%1