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NSString *utf8HtmlStr = @"xbabay";
utf8HtmlStr = [utf8HtmlStr stringByReplacingOccurrencesOfString:@"ba" withString:@"z" options:NSRegularExpressionSearch range:NSMakeRange(0, utf8HtmlStr.length)];
NSString *utf8HtmlStr = @"xbabay";
NSString *occurrencesString = @"ba";
NSRange range = [utf8HtmlStr rangeOfString:occurrencesString];
utf8HtmlStr = [utf8HtmlStr stringByReplacingCharactersInRange:range withString:@"z"];
NSLog(@"%@",utf8HtmlStr);