去字符串某两个符号之前的字符

 NSString* string=@"厂区名：养殖二厂；设发我发我备名：3号设备；are噶而过：温度；设备号：123456；";

    NSString* pattern=@":|;";

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

    NSArray *matches = [regex matchesInString:string options:0 range:NSMakeRange(0, string.length)];

    NSMutableArray*  rangeArr=[[NSMutableArray alloc] init];

    for (NSTextCheckingResult* match in matches) {

        [rangeArr addObject:[NSValue valueWithRange:match.range]];//找到每个分号和冒号的Range，存到数组

    }

    for (int i=0; i<rangArr.count;i=I+2){

         NSRange range=[[rangeArr objectAtIndex:i] rangeValue];

         NSInteger location=range.location;

        NSRange nextRange=[[rangeArr objectAtIndex:i+1] rangeValue];

        NSInteger  nextLocation=nextRange.location;

        NSRange  finalRange=NSMakeRange(range.location+1, nextLocation-location-1);

        NSString*  finalStr=[string substringWithRange:finalRange];

        NSLog(@"%@",finalStr);//这是解析到的字符串

    }