From 63c24c4c7e25bdf794de01157523397a9280df92 Mon Sep 17 00:00:00 2001
From: evanljp <evanljp@outlook.com>
Date: Fri, 11 May 2018 12:08:48 +0800
Subject: [PATCH] reapired the mistake ,which is the regular expression can
 inut a nill string

---
 notes/剑指 offer 题解.md | 1 +
 1 file changed, 1 insertion(+)

diff --git a/notes/剑指 offer 题解.md b/notes/剑指 offer 题解.md
index 5e2b2553..8593f936 100644
--- a/notes/剑指 offer 题解.md	
+++ b/notes/剑指 offer 题解.md	
@@ -1017,6 +1017,7 @@ public boolean match(char[] str, char[] pattern) {
 
 ```java
 public boolean isNumeric(char[] str) {
+    if(str.length==0||str==null) return false;
     return new String(str).matches("[+-]?\\d*(\\.\\d+)?([eE][+-]?\\d+)?");
 }
 ```