取代RegExKitLite的NSRegularExpression

Question

现在我的应用程序targets >iOS4我正在尽可能地移除对非Apple框架的依赖。

我现在有这个代码

    NSString *destination =@"HHH-DDDD>dddd,ffff";
    NSString *searchString = destination;
    NSString *regexString  = @"[^a-zA-Z\?]";
    NSArray  *splitArray   = NULL;
    splitArray = [searchString componentsSeparatedByRegex:regexString];

这将生成一个在所有字符之间包含字符串元素的数组。即"HHH"，"DDDD"，"dddd"，"ffff“。

在NSRegularExpression中似乎根本没有对应的东西，或者是我读错了文档？

Answer 1

看起来你是对的，但你可以使用一个类别：

#import "NSString+RegEx_Array.h"

@implementation NSString (RegEx_Array)

- (NSArray*)componentsSeparatedByRegex2:(NSString *)pattern
{
    NSUInteger pos = 0;
    NSRange area = NSMakeRange(0, [self length]);

    NSRegularExpression *regEx = [NSRegularExpression 
                                  regularExpressionWithPattern:pattern 
                                  options:0 error:nil];

    NSArray *matchResults = [regEx matchesInString:self options:0 range:area];

    NSMutableArray *returnArray = [NSMutableArray arrayWithCapacity:matchResults.count];

    for (NSTextCheckingResult *result in matchResults) {
        NSRange substrRange = NSMakeRange(pos, [result range].location-pos);
        [returnArray addObject:[self substringWithRange:substrRange]];
        pos = [result range].location + [result range].length;
    }

    if (pos < area.length) {
        [returnArray addObject:[self substringFromIndex:pos]];
    }

    return returnArray;
}

@end

但我必须承认，它并不像RegexKitLite那样出色。以下是一个无意义文件的输出：

2012-02-08 00:16:32.251 shittyagain[96057:c03] String-Length: 36355200
2012-02-08 00:16:36.420 shittyagain[96057:c03] Time taken RegexKitLite: 4.167
2012-02-08 00:16:42.989 shittyagain[96057:c03] Time taken NSRegularExp: 6.568

以及测试代码：

NSString *regx = @"[^a-zA-Z\?]";
NSString *file = [[NSBundle mainBundle]pathForResource:@"reallylong" ofType:nil];
NSString *searchString = [NSString stringWithContentsOfFile:file encoding:NSUTF8StringEncoding error:nil];

NSLog(@"String-Length: %ld", searchString.length);

NSDate *preDate = [NSDate date];
[searchString componentsSeparatedByRegex:regx];
NSLog(@"Time taken RegexKitLite: %1.3f", [preDate timeIntervalSinceNow]*-1);

NSDate *preDate2 = [NSDate date];
[searchString componentsSeparatedByRegex2:regx];
NSLog(@"Time taken NSRegularExp: %1.3f", [preDate2 timeIntervalSinceNow]*-1);

我不确定区别是否真的很重要，因为文件的大小约为36MB，但以防万一有人真的需要它，他必须使用RegexKitLite。我想如果有人可以发布一些真正的性能测试和/或默认的NSRegularExpression方法。我想知道哪个更快=)