A visible character: [\p{Alnum}\p{Punct}]
A printable character: [\p{Graph}\x20]
A space or a tab: [ \t]
A control character: [\x00-\x1F\x7F]
\p{XDigit}
A hexadecimal digit: [0-9a-fA-F]
A whitespace character: [ \t\n\x0B\f\r]
java.lang.Character classes (simple )
\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()
Classes for Unicode blocks and categories
\p{InGreek}
A character in the Greek block (simple )
An uppercase letter (simple )
A currency symbol
\P{InGreek}
Any character except one in the Greek block (negation)
[\p{L}&&[^\p{Lu}]]
Any letter except an uppercase letter (subtraction)
Boundary matchers
The beginning of a line（标记开始）
The end of a line（标记结束）
A word boundary
A non-word boundary
The beginning of the input
The end of the previous match
The end of the input but for the final , if any
The end of the input
Greedy quantifiers
X, once or not at all
X, zero or more times
X, one or more times
X, exactly n times
X, at least n times
X, at least n but not more than m times
Reluctant quantifiers
X, once or not at all
X, zero or more times
X, one or more times
X, exactly n times
X, at least n times
X, at least n but not more than m times
Possessive quantifiers
X, once or not at all
X, zero or more times
X, one or more times
X, exactly n times
X, at least n times
X, at least n but not more than m times
Logical operators
X followed by Y
Either X or Y
Back references
Whatever the nth
Nothing, but quotes the following character
Nothing, but quotes all characters until \E
Nothing, but ends quoting started by \Q
Special constructs (non-capturing)
X, as a non-capturing group
(?idmsux-idmsux)
Nothing, but turns match flags
(?idmsux-idmsux:X)&
with the given flags
X, via zero-width positive lookahead
X, via zero-width negative lookahead
X, via zero-width positive lookbehind
X, via zero-width negative lookbehind
X, as an independent, non-capturing group
Backslashes, escapes, and quoting
The backslash character ('\') serves to introduce escaped constructs, as defined in the table above, as well as to quote characters that otherwise would be interpreted as unescaped constructs. Thus the expression \\ matches a single backslash and \{ matches a left brace.
It is an error to use a backslash prior to any alphabetic character that does not denote
these are reserved for future extensions to the regular-expression language. A backslash may be used prior to a non-alphabetic character regardless of whether that character is part of an unescaped construct.
Backslashes within string literals in Java source code are interpreted as required by the
or other . It is therefore necessary to double backslashes in string literals that represent regular expressions to protect them from interpretation by the Java bytecode compiler. The string literal "\b", for example, matches a single backspace character when interpreted as a regular expression, while "\\b" matches a word boundary. The string literal "\(hello\)" is illegal and leads to a compile- in order to match the string (hello) the string literal "\\(hello\\)" must be used.
Character Classes
Character classes may appear within other character classes, and may be composed by the union operator (implicit) and the intersection operator (&&). The union operator denotes a class that contains every character that is in at least one of its operand classes. The intersection operator denotes a class that contains every character that is in both of its operand classes.
The precedence of character-class operators is as follows, from highest to lowest:
Literal escape&&&
[a-e][i-u]
Intersection
[a-z&&[aeiou]]
Note that a different set of metacharacters are in effect inside a character class than outside a character class. For instance, the regular expression . loses its special meaning inside a character class, while the expression - becomes a range forming metacharacter.
Line terminators
A line terminator is a one- or two-character sequence that marks the end of a line of the input character sequence. The following are recognized as line terminators:
A newline (line feed) character ('\n'),
A carriage-return character followed immediately by a newline character ("\r\n"),
A standalone carriage-return character ('\r'),
A next-line character ('\u0085'),
A line-separator character ('\u2028'), or
A paragraph-separator character ('\u2029).
mode is activated, then the only line terminators recognized are newline characters.
The regular expression . matches any character except a line terminator unless the
flag is specified.
By default, the regular expressions ^ and $ ignore line terminators and only match at the beginning and the end, respectively, of the entire input sequence. If
mode is activated then ^ matches at the beginning of input and after any line terminator except at the end of input. When in
mode $ matches just before a line terminator or the end of the input sequence.
Groups and capturing
Capturing groups are numbered by counting their opening parentheses from left to right. In the expression ((A)(B(C))), for example, there are four such groups:
((A)(B(C)))
Group zero always stands for the entire expression.
Capturing groups are so named because, during a match, each subsequence of the input sequence that matches such a group is saved. The captured subsequence may be used later in the expression, via a back reference, and may also be retrieved from the matcher once the match operation is complete.
The captured input associated with a group is always the subsequence that the group most recently matched. If a group is evaluated a second time because of quantification then its previously-captured value, if any, will be retained if the second evaluation fails. Matching the string "aba" against the expression (a(b)?)+, for example, leaves group two set to "b". All captured input is discarded at the beginning of each match.
Groups beginning with (? are pure, non-capturing groups that do not capture text and do not count towards the group total.
Unicode support
This class is in conformance with Level 1 of
, plus RL2.1 Canonical Equivalents.
Unicode escape sequences such as \u2014 in Java source code are processed as described in
of the Java Language Specification. Such escape sequences are also implemented directly by the regular-expression parser so that Unicode escapes can be used in expressions that are read from files or from the keyboard. Thus the strings "\u2014" and "\\u2014", while not equal, compile into the same pattern, which matches the character with hexadecimal value 0x2014.
Unicode blocks and categories are written with the \p and \P constructs as in Perl. \p{prop} matches if the input has the property prop, while \P{prop} does not match if the input has that property. Blocks are specified with the prefix In, as in InMongolian. Categories may be specified with the optional prefix Is: Both \p{L} and \p{IsL} denote the category of Unicode letters. Blocks and categories can be used both inside and outside of a character class.
The supported categories are those of
in the version specified by the
class. The category names are those defined in the Standard, both normative and informative. The block names supported by Pattern are the valid block names accepted and defined by .
Categories that behave like the java.lang.Character boolean ismethodname methods (except for the deprecated ones) are available through the same \p{prop} syntax where the specified property has the name javamethodname.
Comparison to Perl 5
The Pattern engine performs traditional NFA-based matching with ordered alternation as occurs in Perl 5.
Perl constructs not supported by this class:
The conditional constructs (?{X}) and (?(condition)X|Y),
The embedded code constructs (?{code}) and (??{code}),
The embedded comment syntax (?#comment), and
The preprocessing operations \l \u, \L, and \U.
Constructs supported by this class but not by Perl:
Possessive quantifiers, which greedily match as much as they can and do not back off, even when doing so would allow the overall match to succeed.
Character-class union and intersection as described
Notable differences from Perl:
In Perl, \1 through \9 are always interprete a backslash-escaped number greater than 9 is treated as a back reference if at least that many subexpressions exist, otherwise it is interpreted, if possible, as an octal escape. In this class octal escapes must always begin with a zero. In this class, \1 through \9 are always interpreted as back references, and a larger number is accepted as a back reference if at least that many subexpressions exist at that point in the regular expression, otherwise the parser will drop digits until the number is smaller or equal to the existing number of groups or it is one digit.
Perl uses the g flag to request a match that resumes where the last match left off. This functionality is provided implicitly by the
class: Repeated invocations of the
method will resume where the last match left off, unless the matcher is reset.
In Perl, embedded flags at the top level of an expression affect the whole expression. In this class, embedded flags always take effect at the point at which they appear, whether they are at the top lev in the latter case, flags are restored at the end of the group just as in Perl.
Perl is forgiving about malformed matching constructs, as in the expression *a, as well as dangling brackets, as in the expression abc], and treats them as literals. This class also accepts dangling brackets but is strict about dangling metacharacters like +, ? and *, and will throw a
if it encounters them.
For a more precise description of the behavior of regular expression constructs, please see
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与Jinggang相似词语
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1.&Mountains 井冈山(旧译Chingkang Mountains)
Jinggang的用法例句
1. QingDao JingGang Hot Stamper Machinery CO., LTD 青岛景钢烫印设备有限公司 2. Jinggang Shan was the base of Red Army. 井冈山是红军的根据地。 3. Jinggang County located at Tokyo nearby, southeast Izu peninsula. 静冈县位于东京附近，伊豆半岛东南部。 4. The Jinggang Mountains, chinese revolution the first hill. 井冈山,中国革命第一山。 5. The Jinggang Mountains lie on the border of Jiangxi and Hunan provinces. 井岗山在江西湖南交界处。 6. Studies of ranking methods on flora or pteridophyta plants in Jinggang MT. 井冈山蕨类植物区系排序研究。jinggobell(架子鼓) 义乌九拍-&义乌九拍...
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