reghex is a JavaScript library that lets developers build fast, lightweight parsers by writing a regex‑like DSL inside tagged template literals. It compiles these definitions into sequences of sticky (`y`) regular expressions—optionally via a Babel macro—for runtime parsing that returns structured AST‑style nodes, with support for nesting, quantifiers, look‑aheads, and custom transformations. The tool is aimed at front‑end developers and language tooling authors who want a quick, code‑gen‑based way to create custom parsers without writing a full parser generator.