fancy-regex 0.19.2

An implementation of regexes, supporting a relatively rich set of features, including backreferences and look-around. Aims to be compatible with Oniguruma syntax when the relevant flag is set.
Documentation 
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# Features

This crate supports several optional features that can be enabled or disabled:

- **`std`** (enabled by default): Enables standard library support. Disable for `no_std` environments.
- **`unicode`** (enabled by default): Enables Unicode support for character classes and word boundaries.
- **`perf`** (enabled by default): Enables performance optimizations in the underlying regex engine.
- **`perf-dfa-full`** (disabled by default): Let regex-automata eagerly build a fully compiled dense DFA for small patterns (and delegated fragments). Trades noticeably slower compiles and more memory for the fastest search engine; without it searches use the lazy DFA, which performs about the same on typical workloads. Mirrors the `regex` crate's `perf-dfa-full` opt-in.
- **`variable-lookbehinds`** (enabled by default): Enables support for variable-length lookbehind
  assertions (e.g., `(?<=a+)`). Without this feature, only constant-length lookbehinds are supported.
  This feature uses reverse DFA matching from the `regex-automata` crate to efficiently handle
  variable-length patterns that don't use backreferences or other fancy features.
- **`leftmost_longest`** (disabled by default): Enables support for switching on leftmost-longest match semantics in the `RegexBuilder`/`RegexOptionsBuilder`, as opposed to the usual leftmost-first.