RegEx basic

	Description	Examples
.	match any one character	.a.. sales1.xls
[ ]	define a character set	[ns]a[0-9]\.xls sam.xls na1.xls
^	anything but	[ns]a[0-9]\.xls sam.xls na1.xls
\d \D \w \W	any digit, same as [0-9] any nondigit [^0-9] same as [a-zA-Z0-9_]	\w\d\w\d\w\d M1B4F2 90046 H1H2H2
+	match one or more char	\w+@\w+\.\w+ Send personal email to ben@forta.com.
*	match 0 or more char	\w+[\w.]*@[\w.]+\.\w+ Hello .ben@forta.com is my email address.
?	match only 0 or 1 char	https?://[\w./]+ securely use https://www.forta.com/ instead.
{ }	intervals: {2,4}: min 2, max 4 {3,}: at least 3	\d{1,2}[-\/]\d{1,2}[-\/]\d{2,4} 4/8/03 10-6-2004 2/2/2 \d+: \$\d{3,}\.\d{2} 1001: $496.80 1002: $1290.69 1003: $26.43
*? +? {n,}?	Lazy matching *, +, {n,} are greedy matching	<[Bb]>.*</[Bb]> living in <B>AK</B> and <B>HI</B> <[Bb]>.*?</[Bb]> living in <B>AK</B> and <B>HI</B>
\b \B	match the start or end of a word,	\bcat\b The cat scattere cap\b captain recap
( )	treat as single entity	&nbsp;{2,} Windows&nbsp;&nbsp;200 (it matches &nbsp;;;;;) (&nbsp;){2,} Windows&nbsp;&nbsp;200 (\d{1,3}\.){3}\d{1,3} Pinging [12.159.46.200] (19|20)\d{2} DOB: 1967-08-17
?= ?<=	look ahead look behind	.+(?=:) http://www.forta.com/ (?<=\$)[0-9.]+ ABC01: $23.45