Look-behinds [1 / 6]: regex-syntax support #1315
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Here is the first out of six PRs aiming to bring look-behinds to rust-regex. See #1266 for more information, notably the implementation plan.
In this PR we focus on adding look-behind support to the regex-syntax crate. New additions are hidden behind a feature flag to not break compatibility with other crates.
Currently the CI fails on generation of docsrs. This is due to all features being enabled during generation which breaks regex-automata. This will be fixed in the second PR which works on regex-automata.