looks like `re` doesn't get autoreleased.

It's a bummer how verbose regexps get in Cocoa :-(

If you are so inclined, you can do something like ...

```
    NSString *someStr = @"key=val";
    NSRange colonRange = [someStr rangeOfString:@"="];
    NSString *key = [someStr substringToIndex:colonRange.location];
    NSString *val = [someStr substringFromIndex:colonRange.location + 1];
```

https://github.com/facebook/xctool/blob/master/xctool/xctool/Options.m#L193