## What it does
Flags `$` characters in prose that are not part of a recognised math region.
## Why
Some Markdown renderers (Pandoc with `--mathjax`, KaTeX-aware mdBook, GitHub) treat `$…$` as
inline math. Authors who rely on TeX-style `\( … \)` instead can accidentally produce math
output where they wanted a literal `$5`, and authors who rely on `$…$` for math can produce
prose where they meant math. Either way, a stray single `$` in prose is almost always a typo.
This rule is opt-in because projects that consistently use `$…$` for math have no use for it.
The linter would flood with false positives. Turn it on in projects that standardise on
`\( … \)` or no inline math at all.
The autofix escapes the dollar (`\$`); review before applying.
## Example (bad)
```markdown
That costs $5.
```
## Example (good)
```markdown
That costs \$5.
```
## Configuration
- This rule is off by default. Enable with `[lint] extend-select = ["stray-dollar"]`.
- Disable inline: `<!-- mdwright: allow stray-dollar -->`.
- Severity: non-advisory. Safe autofix available.
## References
- Pandoc Markdown: math extension.
- mdwright treats `\( … \)`, `\[ … \]`, and named environments as math regions; `$…$` is
excluded by default because it conflicts with literal-dollar prose.