add: 只出现一次的数字等

src/string/repeated-substring-pattern.js

@@ -0,0 +1,6 @@
+// LeetCode 459. 重复的子字符串 https://leetcode-cn.com/problems/repeated-substring-pattern/
+// LintCode 1227. 重复的子串模式 https://www.lintcode.com/problem/repeated-substring-pattern/description
+
+export default (str) => {
+  return /^(\w+)\1+$/.test(str)
+}