Regular Expression Symbols

^	Beginning of a line
$	End of a line
.	Any character
Expression?	The expression zero or one times
Expression*	The expression zero or more times
Expression+	The expression one or more times
Expression{n}	The expression n times
Expression{n,}	The expression at least n times
Expression{n,m}	The expression at least n but no more than m times
Expression1\|Expression2	The expression1 or the expression2
(Expression)	The expression within the brackets
\1 \2 ... \n	The content of the nth bracket