--- /dev/null
+# custom-property-pattern
+
+Specify a pattern for custom properties.
+
+```css
+a { --foo-: 1px; }
+/** ↑
+ * The pattern of this */
+```
+
+## Options
+
+`regex|string`
+
+A string will be translated into a RegExp like so `new RegExp(yourString)` — so be sure to escape properly.
+
+Given the string:
+
+```js
+"foo-.+"
+```
+
+The following patterns are considered violations:
+
+```css
+:root { --boo-bar: 0; }
+```
+
+The following patterns are *not* considered violations:
+
+```css
+:root { --foo-bar: 0; }
+```