Eclipse中使用正则表达式搜索替换
2011-11-29 11:28 阅读(1930)评论(0)
最近在eclipse开发中用到正则表达式搜索替换，顺便总结。
搜索：^(.*)<h:outputText.*value=.*"#{(.*)}"(.*)$
替换：$1<h:outputText value= "#{strings.trim($2,30)}"$3
实现的功能是能找到代码中类似：
<h:outputText value="#{appl.departmentName}" />
的行。并替换为：
<h:outputText value= "#{strings.trim(appl.applicantName,30)}" />
在上一组搜索表达式基础上作了些改进：
搜索：^(.*)<h:outputText(.*R??.*)value=p{Space}*"#{(.*)}"(.*)$
替换：$1<h:outputText$2value="#{strings.trim($3,30)}"$4
这组条件考虑到了中间带换行的情况。
这种正则表达式的编写有3个问题要注意：
1.有些特殊字符需要转意。例如：{ ( 这种字符被正则表达式语法赋予了新意义，因此要用{ ( 来代表原字符。
2.用( )对来截取字段中需要保留的变化部分。再用$1 , $2 , $3 ...$n 在替换字段里复用他们。
3.注意eclipse里的换行是 R ，不是下面文档里的 。
以下是正则表达式语法的详细列举：
Construct Matches Characters Character classes Predefined character classes POSIX character classes (US-ASCII only) Classes for Unicode blocks and categories Boundary matchers Greedy quantifiers Reluctant quantifiers Possessive quantifiers Logical operators Back references Quotation Special constructs (non-capturing)| x | The character x |
| \ | The backslash character |
| n | The character with octal value 0n (0 <= n <= 7) |
| nn | The character with octal value 0nn (0 <= n <= 7) |
| mnn | The character with octal value 0mnn (0 <= m <= 3, 0 <= n <= 7) |
| xhh | The character with hexadecimal value 0xhh |
| uhhhh | The character with hexadecimal value 0xhhhh |
| The tab character (' ') | |
| The newline (line feed) character (' ') | |
| The carriage-return character (' ') | |
| f | The form-feed character (' ') |
| a | The alert (bell) character ('\u0007') |
| e | The escape character ('\u001B') |
| cx | The control character corresponding to x |
| [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) |
| . | Any character (may or may not match line terminators) |
| d | A digit: [0-9] |
| D | A non-digit: [^0-9] |
| s | A whitespace character: [ x0Bf ] |
| S | A non-whitespace character: [^s] |
| w | A word character: [a-zA-Z_0-9] |
| W | A non-word character: [^w] |
| 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}] |
| p{Blank} | A space or a tab: [ ] |
| p{Cntrl} | A control character: [x00-x1Fx7F] |
| p{XDigit} | A hexadecimal digit: [0-9a-fA-F] |
| p{Space} | A whitespace character: [ x0Bf ] |
| 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) |
| ^ | The beginning of a line |
| $ | The end of a line |
| A word boundary | |
| B | A non-word boundary |
| A | The beginning of the input |
| G | The end of the previous match |
| The end of the input but for the final terminator, if any | |
| z | The end of the input |
| 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 |
| 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 |
| 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 |
| XY | X followed by Y |
| X|Y | Either X or Y |
| (X) | X, as a capturing group |
| n | Whatever the nth capturing group matched |
| Nothing, but quotes the following character | |
| Q | Nothing, but quotes all characters until E |
| E | Nothing, but ends quoting started by Q |
| (?: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 |