Regular Expression
/
/
Test String
Substitution
0 Matches
0 ms
Character Classes
.
any character except newline
\w
word character [a-zA-Z0-9_]
\d
digit [0-9]
\s
whitespace
Anchors
^
start of string/line
$
end of string/line
\b
word boundary
Quantifiers
*
0 or more
+
1 or more
?
0 or 1
{n,m}
between n and m