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Character classes

Pattern Description
. Any character, except newline
\w Word
\d Digit
\s Whitespace
\W Not word
\D Not digit
\S Not whitespace
[abc] Any of a, b, or c
[a-e] Characters between a and e
[1-9] Digit between 1 and 9

Anchors

Pattern Description
^abc Start with abc
abc$ End with abc

Escaped characters

Pattern Description
\. \* \\ Escape special character used by regex
\t Tab
\n Newline
\r Carriage return

Groups

Pattern Description
(abc) Capture group

Quantifiers

Pattern Description
a* Match 0 or more
a+ Match 1 or more
a? Match 0 or 1
a{5} Match exactly 5
a{,3} Match up to 3
a{3,} Match 3 or more
a{1,3} Match between 1 and 3
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