IOS 类似微博，#话题#，@人，[表情] 网址 正则匹配

/**
 *获取需要处理的子字符串和子串的range
 */
-(NSArray<NSTextCheckingResult *> *)getBBSLetterSubStrRangeArrWithStr:(NSString *)str{
    //[...]表情
    //@"\[[a-zA-Z\u4e00-\u9fa5]+\]"
    NSString *emopattern=@"\[[u4e00-u9fa5\w]+\]" ;
    //#...#话题
    //@"#[0-9a-zA-Z\u4e00-\u9fa5]+#"
    //   @"#[u4e00-u9fa5\w\s]+#";
    NSString *toppattern =  @"#[^#]+#";
    //@...@
    //@"@[0-9a-zA-Z\U4e00-\u9fa5]+"
    NSString *atpattern = @"@[u4e00-u9fa5\w]+";
    //url
    //@"http://[-a-zA-Z0-9+&@#/%?=~_|!:,.;]*[-a-zA-Z0-9+&@#/%=~_|]"
    NSString *urlpattern = @"\b(([\w-]+://?|www[.])[^\s()<>]+(?:\([\w\d]+\)|([^[:punct:]\s]|/)))";
    NSString *pattern = [NSString stringWithFormat:@"%@|%@|%@|%@",emopattern,toppattern,atpattern,urlpattern];
    NSRegularExpression *regular = [[NSRegularExpression alloc] initWithPattern:pattern options:NSRegularExpressionCaseInsensitive error:nil];
    NSArray *results = [regular matchesInString:str options:0 range:NSMakeRange(0, str.length)];
    
    return results;
}