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: range:NSMakeRange(, str.length)];

    return results;

}