--- /dev/null
+"use strict";
+
+const _ = require("lodash");
+const isCustomProperty = require("../../utils/isCustomProperty");
+const report = require("../../utils/report");
+const ruleMessages = require("../../utils/ruleMessages");
+const validateOptions = require("../../utils/validateOptions");
+
+const ruleName = "custom-property-pattern";
+
+const messages = ruleMessages(ruleName, {
+ expected: "Expected custom property name to match specified pattern"
+});
+
+const rule = function(pattern) {
+ return (root, result) => {
+ const validOptions = validateOptions(result, ruleName, {
+ actual: pattern,
+ possible: [_.isRegExp, _.isString]
+ });
+ if (!validOptions) {
+ return;
+ }
+
+ const regexpPattern = _.isString(pattern) ? new RegExp(pattern) : pattern;
+
+ root.walkDecls(decl => {
+ const prop = decl.prop;
+
+ if (!isCustomProperty(prop)) {
+ return;
+ }
+ if (regexpPattern.test(prop.slice(2))) {
+ return;
+ }
+
+ report({
+ message: messages.expected,
+ node: decl,
+ result,
+ ruleName
+ });
+ });
+ };
+};
+
+rule.ruleName = ruleName;
+rule.messages = messages;
+module.exports = rule;