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Test regular expressions with highlighting
. Any character
\d Digit [0-9]
\w Word [A-Za-z0-9_]
\s Whitespace
* 0 or more
+ 1 or more
? 0 or 1
{n,m} n to m times
^ Start of string
$ End of string
\b Word boundary
(abc) Capture group
(?:abc) Non-capturing
a|b Alternation