build(rust): vendor googletest crate

third_party/crates/regex-automata-0.4.18/src/meta/mod.rs

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+/*!
+Provides a regex matcher that composes several other regex matchers
+automatically.
+
+This module is home to a meta [`Regex`], which provides a convenient high
+level API for executing regular expressions in linear time.
+
+# Comparison with the `regex` crate
+
+A meta `Regex` is the implementation used directly by the `regex` crate.
+Indeed, the `regex` crate API is essentially just a light wrapper over a meta
+`Regex`. This means that if you need the full flexibility offered by this
+API, then you should be able to switch to using this API directly without
+any changes in match semantics or syntax. However, there are some API level
+differences:
+
+* The `regex` crate API returns match objects that include references to the
+haystack itself, which in turn makes it easy to access the matching strings
+without having to slice the haystack yourself. In contrast, a meta `Regex`
+returns match objects that only have offsets in them.
+* At time of writing, a meta `Regex` doesn't have some of the convenience
+routines that the `regex` crate has, such as replacements. Note though that
+[`Captures::interpolate_string`](crate::util::captures::Captures::interpolate_string)
+will handle the replacement string interpolation for you.
+* A meta `Regex` supports the [`Input`](crate::Input) abstraction, which
+provides a way to configure a search in more ways than is supported by the
+`regex` crate. For example, [`Input::anchored`](crate::Input::anchored) can
+be used to run an anchored search, regardless of whether the pattern is itself
+anchored with a `^`.
+* A meta `Regex` supports multi-pattern searching everywhere.
+Indeed, every [`Match`](crate::Match) returned by the search APIs
+include a [`PatternID`](crate::PatternID) indicating which pattern
+matched. In the single pattern case, all matches correspond to
+[`PatternID::ZERO`](crate::PatternID::ZERO). In contrast, the `regex` crate
+has distinct `Regex` and a `RegexSet` APIs. The former only supports a single
+pattern, while the latter supports multiple patterns but cannot report the
+offsets of a match.
+* A meta `Regex` provides the explicit capability of bypassing its internal
+memory pool for automatically acquiring mutable scratch space required by its
+internal regex engines. Namely, a [`Cache`] can be explicitly provided to lower
+level routines such as [`Regex::search_with`].
+
+*/
+
+pub use self::{
+    error::BuildError,
+    regex::{
+        Builder, Cache, CapturesMatches, Config, FindMatches, Regex, Split,
+        SplitN,
+    },
+};
+
+mod error;
+#[cfg(any(feature = "dfa-build", feature = "hybrid"))]
+mod limited;
+mod literal;
+mod prefix;
+mod regex;
+mod reverse_inner;
+mod reverse_suffix;
+#[cfg(any(feature = "dfa-build", feature = "hybrid"))]
+mod stopat;
+mod strategy;
+mod wrappers;