iOS中使用RegexKitLite來試用Regex

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iOS中使用RegexKitLite來試用Regex
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準備工作,下載RegexKitLite
軟體包,解壓後有2個檔案,需要載入到project中。

然後還要載入framework
libicucore.dylib
,因為RegexKitLite是調用這個裡面的API,蘋果規定過不能使用私人的api和沒有發布的api。實際上RegexKitLite對NSString做了擴充,目前只支援NSString,對我來說也夠了...

基本使用的例子(更多資訊參看
官方文檔



1.

  1. NSString *searchString = @
    "This is neat."
    ;  
  2. NSString *regexString  = @"(//w+)//s+(//w+)//s+(//w+)"
    ;  
  3. NSRange   matchedRange = NSMakeRange(NSNotFound, 0UL);  
  4. NSError  *error        = NULL;  
  5. matchedRange = [searchString rangeOfRegex:regexString options:RKLNoOptions inRange:searchRange capture:2L error:&error];  
  6. NSLog(@"matchedRange: %@"
    , NSStringFromRange(matchedRange));  
  7. // 2008-03-18 03:51:16.530 test[51583:813] matchedRange: {5, 2},//匹配到‘is‘
      
  8. NSString *matchedString = [searchString substringWithRange:matchedRange];  
  9. NSLog(@"matchedString: '%@'"
    , matchedString);  
  10. // 2008-03-18 03:51:16.532 test[51583:813] matchedString: 'is' //產生子字串
      

NSString *searchString = @"This is neat.";<br />NSString *regexString = @"(//w+)//s+(//w+)//s+(//w+)";<br />NSRange matchedRange = NSMakeRange(NSNotFound, 0UL);<br />NSError *error = NULL;<br />matchedRange = [searchString rangeOfRegex:regexString options:RKLNoOptions inRange:searchRange capture:2L error:&error];<br />NSLog(@"matchedRange: %@", NSStringFromRange(matchedRange));<br />// 2008-03-18 03:51:16.530 test[51583:813] matchedRange: {5, 2},//匹配到‘is‘<br />NSString *matchedString = [searchString substringWithRange:matchedRange];<br />NSLog(@"matchedString: '%@'", matchedString);<br />// 2008-03-18 03:51:16.532 test[51583:813] matchedString: 'is' //產生子字串

2.找到第一個匹配並返回一個NSString

  1. NSString *searchString  = @
    "This is neat."
    ;  
  2. NSString *regexString   = @"(//w+)//s+(//w+)//s+(//w+)"
    ;  
  3. NSString *matchedString = [searchString stringByMatching:regexString capture:2L];  
  4. NSLog(@"matchedString: '%@'"
    , matchedString);  
  5. // 2008-03-18 03:53:42.949 test[51583:813] matchedString: 'is'
      

NSString *searchString = @"This is neat.";<br />NSString *regexString = @"(//w+)//s+(//w+)//s+(//w+)";<br />NSString *matchedString = [searchString stringByMatching:regexString capture:2L];<br />NSLog(@"matchedString: '%@'", matchedString);<br />// 2008-03-18 03:53:42.949 test[51583:813] matchedString: 'is'

3.尋找和替換,加括弧和概念和Python中的一樣,$1指代第一個括弧中的內容

  1. NSString *searchString      = @
    "This is neat."
    ;  
  2. NSString *regexString       = @"//b(//w+)//b"
    ;  
  3. NSString *replaceWithString = @"{$1}"
    ;  
  4. NSString *replacedString    = NULL;  
  5. replacedString = [searchString stringByReplacingOccurrencesOfRegex:regexString withString:replaceWithString];  
  6. //NSMutableString可以直接替換,並返回替換的次數
      
  7. NSLog(@"replaced string: '%@'"
    , replacedString);  
  8. // 2008-07-01 19:03:03.195 test[68775:813] replaced string: '{This} {is} {neat}.'
      
  9. NSMutableString *mutableString     = [NSMutableString stringWithString:@"This is neat."
    ];  
  10. NSString        *regexString       = @"//b(//w+)//b"
    ;  
  11. NSString        *replaceWithString = @"{$1}"
    ;  
  12. NSUInteger       replacedCount     = 0UL;  
  13. replacedCount = [mutableString replaceOccurrencesOfRegex:regexString withString:replaceWithString];  
  14. NSLog(@"count: %lu string: '%@'"
    , (u_long)replacedCount, mutableString);  
  15. // 2008-07-01 21:25:43.433 test[69689:813] count: 3 string: '{This} {is} {neat}.'
      

NSString *searchString = @"This is neat.";<br />NSString *regexString = @"//b(//w+)//b";<br />NSString *replaceWithString = @"{$1}";<br />NSString *replacedString = NULL;<br />replacedString = [searchString stringByReplacingOccurrencesOfRegex:regexString withString:replaceWithString];<br />//NSMutableString可以直接替換,並返回替換的次數<br />NSLog(@"replaced string: '%@'", replacedString);<br />// 2008-07-01 19:03:03.195 test[68775:813] replaced string: '{This} {is} {neat}.'<br />NSMutableString *mutableString = [NSMutableString stringWithString:@"This is neat."];<br />NSString *regexString = @"//b(//w+)//b";<br />NSString *replaceWithString = @"{$1}";<br />NSUInteger replacedCount = 0UL;<br />replacedCount = [mutableString replaceOccurrencesOfRegex:regexString withString:replaceWithString];<br />NSLog(@"count: %lu string: '%@'", (u_long)replacedCount, mutableString);<br />// 2008-07-01 21:25:43.433 test[69689:813] count: 3 string: '{This} {is} {neat}.'

4.用於拆分,返回一個拆分後的字串數組

  1. NSString *searchString = @
    "This is neat."
    ;  
  2. NSString *regexString  = @"//s+"
    ;  
  3. NSArray  *splitArray   = NULL;  
  4. splitArray = [searchString componentsSeparatedByRegex:regexString];  
  5. // splitArray == { @"This", @"is", @"neat." }
      
  6. NSLog(@"splitArray: %@"
    , splitArray);  

NSString *searchString = @"This is neat.";<br />NSString *regexString = @"//s+";<br />NSArray *splitArray = NULL;<br />splitArray = [searchString componentsSeparatedByRegex:regexString];<br />// splitArray == { @"This", @"is", @"neat." }<br />NSLog(@"splitArray: %@", splitArray);

5.返回所有匹配的字串數組,這個例子中雖然有多個括弧,但是
componentsMatchedByRegex不管

  1. NSString *searchString = @
    "$10.23, $1024.42, $3099"
    ;  
  2. NSString *regexString  = @"//$((//d+)(?://.(//d+)|//.?))"
    ;  
  3. NSArray  *matchArray   = NULL;  
  4. matchArray = [searchString componentsMatchedByRegex:regexString];  
  5. // matchArray == { @"$10.23", @"$1024.42", @"$3099" };
      
  6. NSLog(@"matchArray: %@"
    , matchArray);  
  7. 6.返回所有匹配的字串數組處理所有的括弧  
  8. NSString *searchString  = @"$10.23, $1024.42, $3099"
    ;  
  9. NSString *regexString   = @"//$((//d+)(?://.(//d+)|//.?))"
    ;  
  10. NSArray  *capturesArray = NULL;  
  11. capturesArray = [searchString arrayOfCaptureComponentsMatchedByRegex:regexString];  
  12. /* capturesArray ==
     
  13. [NSArray arrayWithObjects:
     
  14.  [NSArray arrayWithObjects:  @"$10.23",   @"10.23",   @"10", @"23", NULL],
     
  15.  [NSArray arrayWithObjects:@"$1024.42", @"1024.42", @"1024", @"42", NULL],
     
  16.  [NSArray arrayWithObjects:   @"$3099",    @"3099", @"3099",   @"", NULL],
     
  17.  NULL];
     
  18. */
      
  19. NSLog(@"capturesArray: %@"
    , capturesArray);  
  20. 輸出結果:  
  21. shell% ./capturesArray↵  
  22. 2009-05-06 03:25:46.852 capturesArray[69981:10b] capturesArray: (  
  23.        (  
  24.        "$10.23"
    ,  
  25.        "10.23"
    ,  
  26.        10,  
  27.        23  
  28.    ),  
  29.        (  
  30.        "$1024.42"
    ,  
  31.        "1024.42"
    ,  
  32.        1024,  
  33.        42  
  34.    ),  
  35.        (  
  36.        "$3099"
    ,  
  37.        3099,  
  38.        3099,  
  39.        ""
      
  40.    )  

NSString *searchString = @"$10.23, $1024.42, $3099";<br />NSString *regexString = @"//$((//d+)(?://.(//d+)|//.?))";<br />NSArray *matchArray = NULL;<br />matchArray = [searchString componentsMatchedByRegex:regexString];<br />// matchArray == { @"$10.23", @"$1024.42", @"$3099" };<br />NSLog(@"matchArray: %@", matchArray);<br />6.返回所有匹配的字串數組處理所有的括弧<br />NSString *searchString = @"$10.23, $1024.42, $3099";<br />NSString *regexString = @"//$((//d+)(?://.(//d+)|//.?))";<br />NSArray *capturesArray = NULL;<br />capturesArray = [searchString arrayOfCaptureComponentsMatchedByRegex:regexString];<br />/* capturesArray ==<br />[NSArray arrayWithObjects:<br /> [NSArray arrayWithObjects: @"$10.23", @"10.23", @"10", @"23", NULL],<br /> [NSArray arrayWithObjects:@"$1024.42", @"1024.42", @"1024", @"42", NULL],<br /> [NSArray arrayWithObjects: @"$3099", @"3099", @"3099", @"", NULL],<br /> NULL];<br />*/<br />NSLog(@"capturesArray: %@", capturesArray);<br />輸出結果:<br />shell% ./capturesArray↵<br />2009-05-06 03:25:46.852 capturesArray[69981:10b] capturesArray: (<br /> (<br /> "$10.23",<br /> "10.23",<br /> 10,<br /> 23<br /> ),<br /> (<br /> "$1024.42",<br /> "1024.42",<br /> 1024,<br /> 42<br /> ),<br /> (<br /> "$3099",<br /> 3099,<br /> 3099,<br /> ""<br /> )<br />)

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