PartialEq is not implemented in version 0.2

[tredoe]

With the version 0.2, I get:

error[E0369]: binary operation `==` cannot be applied to type `std::option::Option<regex::Regex>`

note: an implementation of `std::cmp::PartialEq` might be missing for `std::option::Option<regex::Regex>`

[BurntSushi]

Indeed it is not. See the changelog please. :-)

[tredoe]

BUG #178: Drop the PartialEq and Eq impls on Regex.

The PartialEq and Eq impls on Regex have been dropped. If you relied on these impls, the fix is to define a wrapper type around Regex, impl Deref on it and provide the necessary impls.

[tredoe]

Please, could you add an example about how do it? For beginners
Thanks!

[BurntSushi]

Oh absolutely! I'm on mobile right now, so it's a a little tough to write it the code, but I'll try to get the idea across and then clean it up later. :-)

The low tech solution is to just change re1 == re2 to re1.as_str() == re2.as_str(). That might be all you need. But if you're, say, using regexes as keys in a btree map, then you'll need a wrapper type that implements PartialEq for you.

First, you need to define a wrapper type: struct MyRegex(regex::Regex). For convenience, you'll want to implement the std::ops::Deref trait. This will make it so you can call all of the methods on Regex through your MyRegex type. Second, you'll need to implement the std::cmp::PartialEq on your MyRegex type, which can be done using the the as_str methods from the "low tech" solution above.