Regular Expressions Reference Card

Title	Reference	Explanation	Example	Matches
Letters Inside Square Brackets	[Ww]	W or w	[Ww]oodwork	Woodwork, woodwork
	[1234567890]	Any digit
Letters outside square brackets	ame	Matches exact sequence	ame -> amersohail794	matches ame
Ranges	[0-9]	0 to 9	[0-2] -> amersohail794	matches 794
	[a-z]	all characters from a to z	[a-z] -> amersohail794	matches amersohail
	[A-Z]	all characters from A to A	[a-z] -> amersohail794	matches nothing
	[ ]	matches space	[] -> amer sohail	matches space only
Not	[^a-z]	Not characters from a-z	[^a-z]	matches 794
	[^a-aA-Z]	Not characters from a-z and from A-Z	[^a-zA-Z] -> amersohail794	matches 794
Beginning of line	^	carret outside the square bracket shows that following character should be matched beginning of the line	^o -> oooohhhh OOOOhhh oooOOOOHHHH	will match to first character only and that is "o"
End of line	$	$ will match end of the line
Pipe Symbol	|	for or. A|a is same as [aA]	W|w	matches W or w
Special Characters	*	0 or more occurences of previous character	o*O*h*	matches oohhh, ooooooooohhhhh,OOOOOhhhhhh,oooOOOOOhhhhh
	+	1 or more occurences of previous character
	?	0 or 1 occurrence of previous character
	.	Any character
	\	is used as escape character	[\.] -> This is sample sentence.	will match the . In the line