Regular expressions (common expressions)

X	Character x
\\	Backslash character
/ N	Characters with octal value 0 n (0 <= n <= 7)
/ nn	Character nn with octal value 0 (0 <= n <= 7)
/ Mnn	Characters with octal value 0 mnn(0 <= m <= 3, 0 <= N <= 7)
\x hh	Character hh with hexadecimal value of 0x
\u HHHH	Character with hexadecimal value of 0x hhhh
\ t	tab (' \u0009 ')
\ n	New lines (line break) (' \u000a ')
\ r	Carriage return character (' \u000d ')
\f	Page break (' \u000c ')
\a	Alarm (Bell) character (' \u0007 ')
\e	Escape character (' \u001b ')
\c x	The control that corresponds to x
[ABC]	a,b or C(Simple Class)
[^ABC]	Any character except a,b , or C(negation)
[A-za-z]	a to z or a to z, the letters at both ends are included (range)
[A-d[m-p]]	a to D or m to p:[a-dm-p](set)
[A-z&&[def]]	d,e or F(intersection)
[A-Z&&[^BC]]	a to Z, except for b and C:[ad-z](minus)
[A-z&&[^m-p]]	a to z, not m to p:[a-lq-z](minus)
.	Any character (may or may not match the line terminator)
\d	Numbers:[0-9]
\d	Non-numeric: [^0-9]
\s	whitespace characters:[\t\n\x0b\f\r]
\s	Non-whitespace characters:[^\s]
\w	Word character:[a-za-z_0-9]
\w	Non-word characters:[^\w]
\p{lower}	Lowercase alphabetic characters:[A-z]
\p{upper}	Uppercase characters:[A-z]
\P{ASCII}	All ASCII:[\x00-\x7f]
\p{alpha}	Alphabetic characters:[\p{lower}\p{upper}]
\p{digit}	Decimal number:[0-9]
\p{alnum}	Alphanumeric characters:[\p{alpha}\p{digit}]
\P{PUNCT}	Punctuation:! " #$%& ' () *+,-./:;<=>[email protected][\]^_ ' {|} ~
\p{graph}	Visible characters:[\p{alnum}\p{punct}]
\p{print}	printable characters:[\p{graph}\x20]
\p{blank}	Space or tab:[\ t]
\p{cntrl}	Control characters:[\x00-\x1f\x7f]
\p{xdigit}	Hex Number:[0-9a-fa-f]
\p{space}	whitespace characters:[\t\n\x0b\f\r]
\p{javalowercase}	Equivalent to Java.lang.Character.isLowerCase ()
\p{javauppercase}	Equivalent to Java.lang.Character.isUpperCase ()
\p{javawhitespace}	Equivalent to Java.lang.Character.isWhitespace ()
\p{javamirrored}	Equivalent to java.lang.Character.isMirrored ()
\p{ingreek}	Greek characters in a block (simple block)
\p{lu}	Capital letters (Simple category)
\P{SC}	Currency symbol
\p{ingreek}	All characters except (negation) in the Greek block
[\p{l}&&[^\p{lu}]	All letters, except capital letters (minus)
^	The beginning of the line
$	End of Line
\b	Word boundaries
\b	Non-word boundary
\a	Start of input
\g	End of last match
\z	The end of the input, only for the last terminator (if any)
\z	End of input
X ?	X, not once or once
X *	X, 0 or more times
X +	X, one or more times
X {n}	X, exactly n times
X {n,}	X, at least n times
X {n,m}	X, at least n times, but not more than m Times
X ??	X, not once or once
X *?	X, 0 or more times
X +?	X, one or more times
X {n}?	X, exactly n times
X {n,}?	X, at least n times
X {n,m}?	X, at least n times, but not more than m Times
X ?+	X, not once or once
X *+	X, 0 or more times
X ++	X, one or more times
X {n}+	X, exactly n times
X {n,}+	X, at least n times
X {n,m}+	X, at least n times, but not more than m Times
Xy	X followed by Y
X | Y	X or Y
(X)	X, as capturing group
\ N	Any matching n-th capturing group
\	Nothing, but references the following characters
\q	Nothing, but all characters are quoted until \e
\e	Nothing, but the end of the reference starting from \q
(?:X)	X, as a non-capturing group
(? idmsux-idmsux)	Nothing, but will match the flag i d M s u x on-off
(? Idmsux-idmsux:X)	x, as with the given flag I d M s u X on-off
(? =X)	X, through a 0-width positive lookahead
(?! X )	X, through a 0-width negative lookahead
(? <=X)	X, through a 0-width positive lookbehind
(? <! X )	X, through a 0-width negative lookbehind
(?>X)	X, as a standalone, non-capturing group

Regular expressions (common expressions)