Regex Cheatsheet

.         - Any Character Except New Line
\d        - Digit (0-9)
\D        - Not a Digit (0-9)
\w        - Word Character (a-z, A-Z, 0-9, _)
\W        - Not a Word Character
\s        - Whitespace (space, tab, newline)
\S        - Not Whitespace (space, tab, newline)

# Anchors
\b        - Word Boundary
\B        - Not a Word Boundary
^         - Beginning of a String
$         - End of a String

[]        - Matches Characters in brackets
[^ ]      - Matches Characters NOT in brackets
|         - Either Or
( )       - Group
\1        - Reference
(?:)      - Non-Capturing Group
(?|(regex1)|(regex2)) - Branch Reset Groups
(?=)      - Positive Lookahead
(?!)      - Negative Lookahead
(?<=)     - Positive Lookbehind
(?<!)     - Negative Lookbehind

Quantifiers:
*         - 0 or More
+         - 1 or More
?         - 0 or One(Optional)
{3}       - Exact Number
{3,4}     - Range of Numbers (Minimum, Maximum)

Flags:
g - Global
m - Multiline
i - Ignore case