//以替换html元素<a href="Xxxx">Yyyy</a>中的标签为例。
- (NSString *)removeTag:(NSString *)srcStr {
NSError *error = nil;
NSMutableString *dest = [NSMutableString stringWithCapacity:0];
NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"<a href=\".+?\">(.+?)</a>" options:NSRegularExpressionCaseInsensitive error:&error];
NSRegularExpression *regex2 = [[NSRegularExpression alloc] initWithPattern:@"(?<=>).*?(?=</a>)" options:NSRegularExpressionCaseInsensitive error:nil];
NSUInteger numberOfMatches = [regex numberOfMatchesInString:srcStr options:0 range:NSMakeRange(0, [srcStr length])];
if (numberOfMatches != 0) {
[dest appendString:srcStr];
/*以下几行是一个方法调用,有点长就分行了(本人一般不习惯分行的,即使巨长的一个方法调用,但是这个调用中有个方法定义做参数,所以……)。*/
[regex enumerateMatchesInString:srcStr options:0 range:NSMakeRange(0, [srcStr length]) usingBlock:^(NSTextCheckingResult *result, NSMatchingFlags flags, BOOL *stop) {
NSString *resultString = [srcStr substringWithRange:[result range]];
NSString *link = [resultString substringWithRange:[[regex2 firstMatchInString:resultString options:0 range:NSMakeRange(0, [resultString length])] range]];
[dest replaceCharactersInRange:[result range] withString:link];
}
];
return [dest stringByReplacingOccurrencesOfString:@"<br />" withString:@""];
}
else {
return [srcStr stringByReplacingOccurrencesOfString:@"<br />" withString:@""];
}
}
//调用
- (void)viewDidLoad {
NSLog([self performSelector:@selector(removeTag:) withObject:@"this is <a href=\"www.baidu.com\">a</a> test!"]);
}