Guide to Adding Captureless Lookbehinds in Rust Regex Engine
By
emschwartz
Crackling crust, pillowy middle. The kind of bagel that earns a second cup of coffee.
Summary
An annotated guide to adding captureless lookbehinds to the Rust linear-time regex engine. The article discusses the implementation of a new feature in the Rust language's official regex engine, focusing on unbounded captureless lookbehinds.
Key quotes
· 2 pulledIn a previous blogpost, Erik wrote about how he implemented the linear time matching algorithm from [RegElk+PLDI24] in the popular regex engine RE2.
Lookbehinds allow regexes to make assertions about things preceding some part of the regex pattern.
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