Regex Characters Cheat Sheet

.               Any character except newline.
\.              A period (and so on for \*, \(, \\, etc.)
^               The start of the string.
$               The end of the string.
\d,\w,\s        A digit, word character [A-Za-z0-9_], or whitespace.
\D,\W,\S        Anything except a digit, word character, or whitespace.
[abc]           Character a, b, or c.
[a-z]           a through z.
[^abc]          Any character except a, b, or c.
aa|bb           Either aa or bb.
?               Zero or one of the preceding element.
*               Zero or more of the preceding element.
+               One or more of the preceding element.
{n}             Exactly n of the preceding element.
{n,}            n or more of the preceding element.
{m,n}           Between m and n of the preceding element.
??,*?,+?,
{n}?, etc.      Same as above, but as few as possible.
(expr)          Capture expr for use with \1, etc.
(?:expr)        Non-capturing group.
(?=expr)        Followed by expr.
(?!expr)        Not followed by expr.