regex

Ketan Jetty
enthusiasm for technology

regex

	RegEx
	-----
	flags
	g - global match
	i - ignore case
	m - match over multiple lines

	Escaping
	\ - special characters to literal and literal characters to special

	Quantifiers
	? - matches zero or one times
	* - matches zero or more times
	+ - matches one or more times
	{n} - matches n times
	{n, m} - matches at least n times, but not more than m times

	Anchors
	^ - matches at the start of the line
	$ - matches at the end of the line
	\b - matches at the beginning or the end of a word

	delimiter
	(?:x) - matches x not remember the match
	x(?=y) - matches x only if x is followed by y
	x(?!y) - matches x only if x is not followed by y

	Character Escapes
	\s - matches whitespace 
	\S - matches anything but a whitespace 
	\f - matches a form-feed
	\n - matches a linefeed
	\r - matches a carriage return
	\t - matches a horizontal tab
	\v - matches vertical tab
	\w - matches any alphanumeric character including the underscore. Equivalent to [A-Za-z0-9_] 
	\W - matches any non-word character. Equivalent to [^A-Za-z0-9_] 

	Others
	. - matches any character except a newline
	

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