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public abstract MappedByteBuffer map( FileChannel.MapMode  mode,long position,long size)throws IOException

 1 /** Print line comment in java files
 2  * 20/03/2006 01:16
 3  *  @author  Pp
 4   */

 5
 6 import  java.util.regex.Pattern;
 7 import  java.util.regex.Matcher;
 8 import  java.nio.channels.FileChannel;
 9 import  java.nio.charset.Charset;
10 import  java.nio.charset.CharsetDecoder;
11 import  java.io.File;
12 import  java.io.FileInputStream;
13 import  java.nio.ByteBuffer;
14 import  java.nio.CharBuffer;
15
16 public   class  CharBufferExample  {
17      /**
18      *  @param  args
19       */

20      public   static   void  main(String[] args)   throws  Exception {
21          // pattern matchs the comments
22         Pattern pa  =  Pattern.compile( " //.*$ " , Pattern.MULTILINE);
23          // Channel for the java file
24         FileChannel fc  =   new  FileInputStream( new  File( " CharBufferExample.java " )).getChannel();
25          // CharBuffer from source file
26         
27          // Maps a region of this channel's file directly into memory
28         ByteBuffer bb  =  fc.map(FileChannel.MapMode.READ_ONLY,  0 , ( int )fc.size());
29         Charset cs  =  Charset.forName( " 8859_1 " );
30         CharsetDecoder cd  =  cs.newDecoder();
31         CharBuffer cb  =  cd.decode(bb);
32         
33          // Some Matches
34         Matcher mc  =  pa.matcher(cb);
35          while (mc.find())  {
36             System.out.println( " Find Comments:  "   +  mc.group());
37         }

38     }

39 }

40
41
42 /** Console:
43  *  Find Comments: //pattern matchs the comments
44  *  Find Comments: //.*$", Pattern.MULTILINE);
45  *  Find Comments: //Channel for the java file
46  *  Find Comments: //CharBuffer from source file
47  *  Find Comments: //Maps a region of this channel's file directly into memory
48  *  Find Comments: //Some Matches
49   */

50




public
Matcher appendReplacement( StringBuffer  sb, String  replacement)

 1 import  java.util.regex. * ;
 2
 3 public   class  First  {
 4      /**
 5      *  @param  args
 6       */

 7      // 不规则字符检查&自动修正
 8      public   static   void  main(String[] args)  {
 9          //  TODO Auto-generated method stub
10         Pattern pa  =  Pattern.compile( " [^A-Za-z0-9\\.\\@_\\-~#]+ " );
11         System.out.println(pa.toString());
12         Matcher mc  =  pa.matcher( " example~ _217  @ h otmail.com " );
13         StringBuffer sb  =   new  StringBuffer( " MM " );
14          boolean  result  =  mc.find();
15          while (result)  {
16             mc.appendReplacement(sb,  "" );
17             System.out.println(sb);
18             result  =  mc.find();
19         }

20         mc.appendTail(sb);
21         System.out.println(sb.toString());
22     }

23 }

24



Summary of regular-expression constructs

Construct Matches
 
Characters
x The character x
\\ The backslash character
\0 n The character with octal value 0n (0 <= n <= 7)
\0 nn The character with octal value 0nn (0 <= n <= 7)
\0 mnn The character with octal value 0mnn (0 <= m <= 3, 0 <= n <= 7)
\x hh The character with hexadecimal value 0xhh
\u hhhh The character with hexadecimal value 0xhhhh
\t The tab character ('\u0009')
\n The newline (line feed) character ('\u000A')
\r The carriage-return character ('\u000D')
\f The form-feed character ('\u000C')
\a The alert (bell) character ('\u0007')
\e The escape character ('\u001B')
\c x The control character corresponding to x
 
Character classes
[abc] a, b, or c (simple class)
[^abc] Any character except a, b, or c (negation)
[a-zA-Z] a through z or A through Z, inclusive (range)
[a-d[m-p]] a through d, or m through p: [a-dm-p] (union)
[a-z&&[def]] d, e, or f (intersection)
[a-z&&[^bc]] a through z, except for b and c: [ad-z] (subtraction)
[a-z&&[^m-p]] a through z, and not m through p: [a-lq-z](subtraction)
 
Predefined character classes
. Any character (may or may not match line terminators)
\d A digit: [0-9]
\D A non-digit: [^0-9]
\s A whitespace character: [ \t\n\x0B\f\r]
\S A non-whitespace character: [^\s]
\w A word character: [a-zA-Z_0-9]
\W A non-word character: [^\w]
 
POSIX character classes (US-ASCII only)
\p{Lower} A lower-case alphabetic character: [a-z]
\p{Upper} An upper-case alphabetic character:[A-Z]
\p{ASCII} All ASCII:[\x00-\x7F]
\p{Alpha} An alphabetic character:[\p{Lower}\p{Upper}]
\p{Digit} A decimal digit: [0-9]
\p{Alnum} An alphanumeric character:[\p{Alpha}\p{Digit}]
\p{Punct} Punctuation: One of !"#$%&'()*+,-./:;<=>?@[\]^_`{|}~
\p{Graph} A visible character: [\p{Alnum}\p{Punct}]
\p{Print} A printable character: [\p{Graph}\x20]
\p{Blank} A space or a tab: [ \t]
\p{Cntrl} A control character: [\x00-\x1F\x7F]
\p{XDigit} A hexadecimal digit: [0-9a-fA-F]
\p{Space} A whitespace character: [ \t\n\x0B\f\r]
 
java.lang.Character classes (simple java character type)
\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 block)
\p{Lu} An uppercase letter (simple category)
\p{Sc} 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
$ The end of a line
\b A word boundary
\B A non-word boundary
\A The beginning of the input
\G The end of the previous match
\Z The end of the input but for the final terminator, if any
\z The end of the input
 
Greedy quantifiers
X ? X, once or not at all
X * X, zero 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 but not more than m times
 
Reluctant quantifiers
X ?? X, once or not at all
X *? X, zero 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 but not more than m times
 
Possessive quantifiers
X ?+ X, once or not at all
X *+ X, zero 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 but not more than m times
 
Logical operators
XY X followed by Y
X | Y Either X or Y
( X ) X, as a capturing group
 
Back references
\ n Whatever the nthcapturing group matched
 
Quotation
\ Nothing, but quotes the following character
\Q Nothing, but quotes all characters until \E
\E Nothing, but ends quoting started by \Q
 
Special constructs (non-capturing)
(?: X ) X, as a non-capturing group
(?idmsux-idmsux)  Nothing, but turns match flags on - off
(?idmsux-idmsux: X )   X, as a non-capturing group with the given flags on - off
(?= X ) X, via zero-width positive lookahead
(?! X ) X, via zero-width negative lookahead
(?<= X ) X, via zero-width positive lookbehind
(?<! X ) X, via zero-width negative lookbehind
(?> X ) X, as an independent, non-capturing group


$
posted on 2006-03-20 01:34 KaLuoTe 阅读(488) 评论(0)  编辑  收藏

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