RegexKitLite学习

http://blog.sina.com.cn/s/blog_71715bf8010165t0.html

准备工作，下载RegexKitLite 软件包，解压后有2个文件，需要加载到project中。

然后还要加载framework libicucore.dylib ，因为RegexKitLite是调用这个里面的API,苹果规定过不能使用私有的api和没有发布的api。实际上RegexKitLite对NSString做了扩展，目前只支持NSString，对我来说也够了...

基本使用的例子（更多信息参看 官方文档 ）

1.

NSString *searchString = @ "This is neat." ;

NSString *regexString = @"(//w+)//s+(//w+)//s+(//w+)" ;

NSRange matchedRange = NSMakeRange(NSNotFound, 0UL);

NSError *error = NULL;

matchedRange = [searchString rangeOfRegex:regexString options:RKLNoOptions inRange:searchRange capture:2L error:&error];

NSLog(@"matchedRange: %@" , NSStringFromRange(matchedRange));

// 2008-03-18 03:51:16.530 test[51583:813] matchedRange: {5, 2}，//匹配到‘is‘

NSString *matchedString = [searchString substringWithRange:matchedRange];

NSLog(@"matchedString: '%@'" , matchedString);

// 2008-03-18 03:51:16.532 test[51583:813] matchedString: 'is' //生成子字符串

NSString *searchString = @"This is neat.";

NSString *regexString = @"(//w+)//s+(//w+)//s+(//w+)";

NSRange matchedRange = NSMakeRange(NSNotFound, 0UL);

NSError *error = NULL;

matchedRange = [searchString rangeOfRegex:regexString options:RKLNoOptions inRange:searchRange capture:2L error:&error];

NSLog(@"matchedRange: %@", NSStringFromRange(matchedRange));

// 2008-03-18 03:51:16.530 test[51583:813] matchedRange: {5, 2}，//匹配到‘is‘

NSString *matchedString = [searchString substringWithRange:matchedRange];

NSLog(@"matchedString: '%@'", matchedString);

// 2008-03-18 03:51:16.532 test[51583:813] matchedString: 'is' //生成子字符串

2.找到第一个匹配并返回一个NSString

NSString *searchString = @ "This is neat." ;

NSString *regexString = @"(//w+)//s+(//w+)//s+(//w+)" ;

NSString *matchedString = [searchString stringByMatching:regexString capture:2L];

NSLog(@"matchedString: '%@'" , matchedString);

// 2008-03-18 03:53:42.949 test[51583:813] matchedString: 'is'

NSString *searchString = @"This is neat.";

NSString *regexString = @"(//w+)//s+(//w+)//s+(//w+)";

NSString *matchedString = [searchString stringByMatching:regexString capture:2L];

NSLog(@"matchedString: '%@'", matchedString);

// 2008-03-18 03:53:42.949 test[51583:813] matchedString: 'is'

3.查找和替换，加括号和概念和Python中的一样，$1指代第一个括号中的内容

NSString *searchString = @ "This is neat." ;

NSString *regexString = @"//b(//w+)//b" ;

NSString *replaceWithString = @"{$1}" ;

NSString *replacedString = NULL;

replacedString = [searchString stringByReplacingOccurrencesOfRegex:regexString withString:replaceWithString];

//NSMutableString可以直接替换，并返回替换的次数

NSLog(@"replaced string: '%@'" , replacedString);

// 2008-07-01 19:03:03.195 test[68775:813] replaced string: '{This} {is} {neat}.'

NSMutableString *mutableString = [NSMutableString stringWithString:@"This is neat." ];

NSString *regexString = @"//b(//w+)//b" ;

NSString *replaceWithString = @"{$1}" ;

NSUInteger replacedCount = 0UL;

replacedCount = [mutableString replaceOccurrencesOfRegex:regexString withString:replaceWithString];

NSLog(@"count: %lu string: '%@'" , (u_long)replacedCount, mutableString);

// 2008-07-01 21:25:43.433 test[69689:813] count: 3 string: '{This} {is} {neat}.'

NSString *searchString = @"This is neat.";

NSString *regexString = @"//b(//w+)//b";

NSString *replaceWithString = @"{$1}";

NSString *replacedString = NULL;

replacedString = [searchString stringByReplacingOccurrencesOfRegex:regexString withString:replaceWithString];

//NSMutableString可以直接替换，并返回替换的次数

NSLog(@"replaced string: '%@'", replacedString);

// 2008-07-01 19:03:03.195 test[68775:813] replaced string: '{This} {is} {neat}.'

NSMutableString *mutableString = [NSMutableString stringWithString:@"This is neat."];

NSString *regexString = @"//b(//w+)//b";

NSString *replaceWithString = @"{$1}";

NSUInteger replacedCount = 0UL;

replacedCount = [mutableString replaceOccurrencesOfRegex:regexString withString:replaceWithString];

NSLog(@"count: %lu string: '%@'", (u_long)replacedCount, mutableString);

// 2008-07-01 21:25:43.433 test[69689:813] count: 3 string: '{This} {is} {neat}.'

4.用于拆分，返回一个拆分后的字符串数组

NSString *searchString = @ "This is neat." ;

NSString *regexString = @"//s+" ;

NSArray *splitArray = NULL;

splitArray = [searchString componentsSeparatedByRegex:regexString];

// splitArray == { @"This", @"is", @"neat." }

NSLog(@"splitArray: %@" , splitArray);

NSString *searchString = @"This is neat.";

NSString *regexString = @"//s+";

NSArray *splitArray = NULL;

splitArray = [searchString componentsSeparatedByRegex:regexString];

// splitArray == { @"This", @"is", @"neat." }

NSLog(@"splitArray: %@", splitArray);

5.返回所有匹配的字符串数组，这个例子中虽然有多个括号，但是 componentsMatchedByRegex不管

NSString *searchString = @ "$10.23, $1024.42, $3099" ;

NSString *regexString = @"//$((//d+)(?://.(//d+)|//.?))" ;

NSArray *matchArray = NULL;

matchArray = [searchString componentsMatchedByRegex:regexString];

// matchArray == { @"$10.23", @"$1024.42", @"$3099" };

NSLog(@"matchArray: %@" , matchArray);

6.返回所有匹配的字符串数组处理所有的括号

NSString *searchString = @"$10.23, $1024.42, $3099" ;

NSString *regexString = @"//$((//d+)(?://.(//d+)|//.?))" ;

NSArray *capturesArray = NULL;

capturesArray = [searchString arrayOfCaptureComponentsMatchedByRegex:regexString];

NSLog(@"capturesArray: %@" , capturesArray);

输出结果：

shell% ./capturesArray↵

2009-05-06 03:25:46.852 capturesArray[69981:10b] capturesArray: (

(

"$10.23" ,

"10.23" ,

10,

23

),

(

"$1024.42" ,

"1024.42" ,

1024,

42

),

(

"$3099" ,

3099,

3099,

""

)

)

NSString *searchString = @"$10.23, $1024.42, $3099";

NSString *regexString = @"//$((//d+)(?://.(//d+)|//.?))";

NSArray *matchArray = NULL;

matchArray = [searchString componentsMatchedByRegex:regexString];

// matchArray == { @"$10.23", @"$1024.42", @"$3099" };

NSLog(@"matchArray: %@", matchArray);

6.返回所有匹配的字符串数组处理所有的括号

NSString *searchString = @"$10.23, $1024.42, $3099";

NSString *regexString = @"//$((//d+)(?://.(//d+)|//.?))";

NSArray *capturesArray = NULL;

capturesArray = [searchString arrayOfCaptureComponentsMatchedByRegex:regexString];

NSLog(@"capturesArray: %@", capturesArray);

输出结果：

shell% ./capturesArray↵

2009-05-06 03:25:46.852 capturesArray[69981:10b] capturesArray: (

(

"$10.23",

"10.23",

10,

23

),

(

"$1024.42",

"1024.42",

1024,

42

),

(

"$3099",

3099,

3099,

""

)

)