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Quick Reference
. Any character (except newline)
\d Digit [0-9]
\w Word char [a-zA-Z0-9_]
\s Whitespace
\b Word boundary
^ Start of string / line
$ End of string / line
* 0 or more
+ 1 or more
? 0 or 1 (optional)
{n,m} Between n and m
(…) Capture group
(?:…) Non-capturing group
(?=…) Positive lookahead
(?!…) Negative lookahead
[abc] Character class
[^abc] Negated class
a|b Alternation