Note that this will fail if someone writes `[space(s)] # K=V`... see below for further discussion about stripping comments.  By "fail", I mean that it will actually match this regexp when you do not want it to.  One way to fix this regexp is to make it like this:

```go
reFlagLine = regexp.MustCompile(`^\s*(\w+)\s*=\s*([^#;]+)`)
```

Regardless, I think a comment (in the code) here about its use would be nice.