# `utils`: Regex and Registration Utilities

```{py:currentmodule} myform.utils
```

Helpers shared by the parser, renderer, and postprocessor: composable pattern builders
(`multi_rgx()`, `define_rgx()`, `regex_dict()`), the escape-aware `NO_ESC` lookbehind, match
unpacking via `parse_match()`, registration-name inference (`name_function()`), and the
`DirectiveKind` taxonomy of MyST directive names.

NOTE: `multi_rgx()` and `regex_dict()` deliberately stay local byte-for-byte copies of
`my.ut` rather than aliases: any module-level `my` import runs the full my-basis package
init (pydantic, srsly, numpy), and this module loads inside mdformat's plugin scan on the
CLI cold path (see `TestPerformance.test_format_cold_start`). The characterization tests
keep the copies in behavioral lockstep with basis.

```{eval-rst}
.. automodule:: myform.utils
   :members:
```