The **path‑expression‑matcher** library provides lightweight, high‑performance tools for tracking a parser’s current location in hierarchical data (XML, JSON, YAML, etc.) and testing that location against expressive path patterns. It offers an `Expression` class for compiling reusable path selectors (with wild‑cards, deep‑wildcards, attribute checks, namespaces, and position selectors) and a `Matcher` class that maintains the live path stack, supports push/pop operations, read‑only views, and fast matching—including bulk matching via `ExpressionSet`. It’s aimed at developers building parsers or data‑processing pipelines who need efficient, rule‑based filtering of nodes.