core/text-ban — forbid a pattern in text

Block a regular expression anywhere in a file’s text. The right tool for prose, config, and literal strings — anything that isn’t a code shape.

What it catches

A banned literal or pattern: a hardcoded hex colour in stylesheets, a leftover marker, a phrase you never want shipped. It reports the line number of each hit.

Config

rules:
  - id: no-raw-hex
    use: core/text-ban
    on: "src/**/*.css"
    ban:
      - "#[0-9a-fA-F]{3,6}\\b"     # raw hex — use a theme token instead
    message: "Use a --color-* theme token, not a raw hex value."
Field What it does
on Glob(s) for the files to scan.
ban A regex, or a list of regexes. A match on any line is a violation (reported with its line number).
message The reason, shown on a block. 
color: var(--color-accent);   ✓ passes
color: #1a73e8;               ✗ blocked: line N matches /#[0-9a-fA-F]{3,6}/

Text, not syntax. core/text-ban is a regex over raw text, so it can match inside strings and comments. For a true code shape (where you want to ignore strings and comments) use core/ast-grep instead.