From 706ff66e04aba797b76c376099581c76550ef052 Mon Sep 17 00:00:00 2001
From: better0332 <better0332@163.com>
Date: Wed, 27 Mar 2013 19:47:13 +0800
Subject: [PATCH] Update 07.3.md

"^[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}$" should be
"^[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}$"
---
 ebook/07.3.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ebook/07.3.md b/ebook/07.3.md
index cee15ec5..dcd18cb8 100644
--- a/ebook/07.3.md
+++ b/ebook/07.3.md
@@ -19,7 +19,7 @@ Go语言通过`regexp`标准包为正则表达式提供了官方支持，如果
 如果要验证一个输入是不是IP地址，那么如何来判断呢？请看如下实现
 
 	func IsIP(ip string) (b bool) {
-		if m, _ := regexp.MatchString("^[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}$", ip); !m {
+		if m, _ := regexp.MatchString("^[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}$", ip); !m {
 			return false
 		}
 		return true