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Character Escapes http://tinyurl.com/5wm3wl 


Escaped Char  Description 
ordinary characters  Characters other than . $ ^ { [ (  ) ] } * + ? \ match themselves. 
\a  Matches a bell (alarm) \u0007. 
\b  Matches a backspace \u0008 if in a []; otherwise matches a word boundary (between \w and \W characters). 
\t  Matches a tab \u0009. 
\r  Matches a carriage return \u000D. 
\v  Matches a vertical tab \u000B. 
\f  Matches a form feed \u000C. 
\n  Matches a new line \u000A. 
\e  Matches an escape \u001B. 
40  Matches an ASCII character as octal (up to three digits); numbers with no leading zero are backreferences if they have only one digit or if they correspond to a capturing group number. (For more information, see Backreferences.) For example, the character 40 represents a space. 
\x20  Matches an ASCII character using hexadecimal representation (exactly two digits). 
\cC  Matches an ASCII control character; for example \cC is controlC. 
\u0020  Matches a Unicode character using a hexadecimal representation (exactly four digits). 
\*  When followed by a character that is not recognized as an escaped character, matches that character. For example, \* is the same as \x2A. 
Character Classes http://tinyurl.com/5ck4ll 


Char Class  Description 
.  Matches any character except \n. If modified by the Singleline option, a period character matches any character. For more information, see Regular Expression Options. 
[aeiou]  Matches any single character included in the specified set of characters. 
[^aeiou]  Matches any single character not in the specified set of characters. 
[09afAF]  Use of a hyphen (–) allows specification of contiguous character ranges. 
\p{name}  Matches any character in the named character class specified by {name}. Supported names are Unicode groups and block ranges. For example, Ll, Nd, Z, IsGreek, IsBoxDrawing. 
\P{name}  Matches text not included in groups and block ranges specified in {name}. 
\w  Matches any word character. Equivalent to the Unicode character categories [\p{Ll}\p{Lu}\p{Lt}\p{Lo}\p{Nd}\p{Pc}]. If ECMAScriptcompliant behavior is specified with the ECMAScript option, \w is equivalent to [azAZ_09]. 
\W  Matches any nonword character. Equivalent to the Unicode categories [^\p{Ll}\p{Lu}\p{Lt}\p{Lo}\p{Nd}\p{Pc}]. If ECMAScriptcompliant behavior is specified with the ECMAScript option, \W is equivalent to [^azAZ_09]. 
\s  Matches any whitespace character. Equivalent to the Unicode character categories [\f\n\r\t\v\x85\p{Z}]. If ECMAScriptcompliant behavior is specified with the ECMAScript option, \s is equivalent to [ \f\n\r\t\v]. 
\S  Matches any nonwhitespace character. Equivalent to the Unicode character categories [^\f\n\r\t\v\x85\p{Z}]. If ECMAScriptcompliant behavior is specified with the ECMAScript option, \S is equivalent to [^ \f\n\r\t\v]. 
\d  Matches any decimal digit. Equivalent to \p{Nd} for Unicode and [09] for nonUnicode, ECMAScript behavior. 
\D  Matches any nondigit. Equivalent to \P{Nd} for Unicode and [^09] for nonUnicode, ECMAScript behavior. 