regex 0.2 0.2.0 ===== This is a new major release of the regex crate, and is an implementation of the [regex 1.0 RFC](https://github.com/rust-lang/rfcs/blob/master/text/1620-regex-1.0.md). We are releasing a `0.2` first, and if there are no major problems, we will release a `1.0` shortly. For `0.2`, the minimum *supported* Rust version is 1.12. There are a number of **breaking changes** in `0.2`. They are split into two types. The first type correspond to breaking changes in regular expression syntax. The second type correspond to breaking changes in the API. Breaking changes for regex syntax: * POSIX character classes now require double bracketing. Previously, the regex `[:upper:]` would parse as the `upper` POSIX character class. Now it parses as the character class containing the characters `:upper:`. The fix to this change is to use `[[:upper:]]` instead. Note that variants like `[[:upper:][:blank:]]` continue to work. * The character `[` must always be escaped inside a character class. * The characters `&`, `-` and `~` must be escaped if any one of them are repeated consecutively. For example, `[&]`, `[\&]`, `[\&\&]`, `[&-&]` are all equivalent while `[&&]` is illegal. (The motivation for this and the prior change is to provide a backwards compatible path for adding character class set notation.) * A `bytes::Regex` now has Unicode mode enabled by default (like the main `Regex` type). This means regexes compiled with `bytes::Regex::new` that don't have the Unicode flag set should add `(?-u)` to recover the original behavior. Breaking changes for the regex API: * `find` and `find_iter` now **return `Match` values instead of `(usize, usize)`.** `Match` values have `start` and `end` methods, which return the match offsets. `Match` values also have an `as_str` method, which returns the text of the match itself. * The `Captures` type now only provides a single iterator over all capturing matches, which should replace uses of `iter` and `iter_pos`. Uses of `iter_named` should use the `capture_names` method on `Regex`. * The `replace` methods now return `Cow` values. The `Cow::Borrowed` variant is returned when no replacements are made. * The `Replacer` trait has been completely overhauled. This should only impact clients that implement this trait explicitly. Standard uses of the `replace` methods should continue to work unchanged. * The `quote` free function has been renamed to `escape`. * The `Regex::with_size_limit` method has been removed. It is replaced by `RegexBuilder::size_limit`. * The `RegexBuilder` type has switched from owned `self` method receivers to `&mut self` method receivers. Most uses will continue to work unchanged, but some code may require naming an intermediate variable to hold the builder. * The free `is_match` function has been removed. It is replaced by compiling a `Regex` and calling its `is_match` method. * 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. * The `is_empty` method on `Captures` has been removed. This always returns `false`, so its use is superfluous. * The `Syntax` variant of the `Error` type now contains a string instead of a `regex_syntax::Error`. If you were examining syntax errors more closely, you'll need to explicitly use the `regex_syntax` crate to re-parse the regex. * The `InvalidSet` variant of the `Error` type has been removed since it is no longer used. * Most of the iterator types have been renamed to match conventions. If you were using these iterator types explicitly, please consult the documentation for its new name. For example, `RegexSplits` has been renamed to `Split`. A number of bugs have been fixed: * [BUG #151](#151): The `Replacer` trait has been changed to permit the caller to control allocation. * [BUG #165](#165): Remove the free `is_match` function. * [BUG #166](#166): Expose more knobs (available in `0.1`) and remove `with_size_limit`. * [BUG #168](#168): Iterators produced by `Captures` now have the correct lifetime parameters. * [BUG #175](#175): Fix a corner case in the parsing of POSIX character classes. * [BUG #178](#178): Drop the `PartialEq` and `Eq` impls on `Regex`. * [BUG #179](#179): Remove `is_empty` from `Captures` since it always returns false. * [BUG #276](#276): Position of named capture can now be retrieved from a `Captures`. * [BUG #296](#296): Remove winapi/kernel32-sys dependency on UNIX. * [BUG #307](#307): Fix error on emscripten.

remove is_empty method on Captures #179

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