--- /dev/null
+/**
+ * @fileoverview Rule to flag octal escape sequences in string literals.
+ * @author Ian Christian Myers
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+ meta: {
+ type: "suggestion",
+
+ docs: {
+ description: "disallow octal escape sequences in string literals",
+ category: "Best Practices",
+ recommended: false,
+ url: "https://eslint.org/docs/rules/no-octal-escape"
+ },
+
+ schema: [],
+
+ messages: {
+ octalEscapeSequence: "Don't use octal: '\\{{sequence}}'. Use '\\u....' instead."
+ }
+ },
+
+ create(context) {
+
+ return {
+
+ Literal(node) {
+ if (typeof node.value !== "string") {
+ return;
+ }
+
+ // \0 represents a valid NULL character if it isn't followed by a digit.
+ const match = node.raw.match(
+ /^(?:[^\\]|\\.)*?\\([0-3][0-7]{1,2}|[4-7][0-7]|0(?=[89])|[1-7])/su
+ );
+
+ if (match) {
+ context.report({
+ node,
+ messageId: "octalEscapeSequence",
+ data: { sequence: match[1] }
+ });
+ }
+ }
+
+ };
+
+ }
+};