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