Regular Expressions

Pattern Description

[]	Matches any single character [ae] "a" in "orange", "a" and "e" in "lane"	Character Classes
[^]	Not matches any single character [^aeio] "r", "g","n" in "region"	Character Classes
[start - end]	Matches any single character in the range from start to end. [A-Z] "A", "B" in "AB123"	Character Classes
.	Matches any single character except \n. a.e => "ave" in "nave" , "ate" in "water"	Character Classes
*	Matches the previous element zero or more times. "be+" => "bee" in "been", "be" in "bent"	Quantifiers
+	Matches the previous element one or more times. \\d*\\.\\d = > ".0", "19.9", "219.9"	Quantifiers
?	Matches the previous element zero or one time. "rai?n" = > "ran", "rain"	Quantifiers
{ n }	Matches the previous element exactly n times. ",\\d{3}" = >",043" in "1,043.6", ",876",",210" in "9,876,210"	Quantifiers
{ n ,}	Matches the previous element one or more times. "\d{2,}" = > "166", "29", "1930"	Quantifiers
{ n , m }	Matches the previous element at least n times, but no more than m times. \d{3,5}" = > "166", "17668" , => "19302" in "193024"	Quantifiers
*?	Matches the previous element zero or more times, but as few times as possible. \d*?\.\d => ".0", "19.9", "219.9"	Quantifiers
+?	Matches the previous element one or more times, but as few times as possible. "be+?" = > "be" in "been", "be" in "bent"	Quantifiers
??	Matches the previous element zero or one time, but as few times as possible. "rai??n" => "ran", "rain"	Quantifiers
{ n }?	Matches the preceding element exactly n times. \\",\\d{3}?" = > ",043" in "1,043.6", ",876", ",210" in "9,876,210"	Quantifiers
{ n ,}?	Matches the previous element at least n times, but as few times as possible. "\\d{2,}?" = > "166", "29", "1930"	Quantifiers
{ n , m }?	Matches the previous element between n and m times, but as few times as possible. \\d{3,5}?" => "166", "17668" , => "193", "024" in "193024"	Quantifiers
^	Match must occur at the beginning of the string/line ^\\d{3} = > "901-" in "901-333-"	Anchors
$	Match must occur at the end of the string/line or before \n at the end of the string/line. -\\d{3}$ = > "-333" in "901-333"	Anchors
\\A	Match must occur at the beginning of the string/line (no multiline support) \\A\\d{3} = > "901" in "901-333"	Anchors
\\Z	Match must occur at the end of the string or before \n at the end of the string -\\d{3}\\Z = > "901" in "901-333"	Anchors
\\z	Match must occur at the end of the string only -\\d{3}\\z = > "-333" in "901-333"	Anchors
\\G	Begin where the last match ended \\G\(\\d\\) => "(1)", "(3)", "(5)" in "(1)(3)(5)[7](9)"	Anchors
\\b	Match must occur on a word boundary \\b\\w+\\s\\w+\\b => "them them" in "them theme them them"	Anchors
\\B	Match must not occur on a word boundary Bend\\w*\\b = > "ends", "ender" in "end sends endure lender"	Anchors
\\w	Match any word characters "I", "D", "A", "1", "3" in "ID A1.3"	Character Classes
\\W	Match any non word characters " ", "." in "ID A1.3"	Character Classes
\\w+	Match one or more word characters
\\w*	Match zero or more word characters
\\s	Match any white space character "D " in "ID A1.3"	Character Classes
\\S	Match any non white space character " _" in "int __ctr"	Character Classes
\\s?	Match zero or one space
\\s*	Match zero or more space
\\d	Match any decimal digit "4" in "4 = IV"	Character Classes
\\D	Match any character not decimal digit " ", "=", " ", "I", "V" in "4 = IV"	Character Classes
[0-9]+	Match one or more decimal digits
[0-9]{0,3}	Match 0 to 3 occurrence of the decimal digits 0 through 9
[-+]?	Match zero or one of either a positive or negative sign

Pattern
SSN pattern: "\d{3}-\d{2}-\d{4}"
ZIP pattern: "\d{5}(-\d{4})?"
US Phone pattern: "(\\d-)?(\\d{3}-)?\\d{3}-\\d{4}"
Date format pattern: "\\d{1,2}(/|-)\\d{1,2}\\1(\\d{4}|\\d{2})$"
Email pattern: "^[\\w-_\\.+]*[\\w-_\\.]\\@([\\w]+\\.)+[\\w]+[\\w]$"
URL pattern: "http://([\w-]+\.)+[\w-]+(/[\w- ./?%&=]*)?"
IPAddress pattern: "^((25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9][0-9]|[0-9])\.){3}(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9][0-9]|[0-9])$"