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From: =?UTF-8?q?=E6=9B=B9=E5=BC=BA?= <caoqiang@jiuqi.com.cn>
Date: Sun, 20 Oct 2019 20:56:22 +0800
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---
 cookbook/c02/p05_search_replace.py         |  1 +
 source/c02/p05_search_and_replace_text.rst | 10 ++++++++++
 2 files changed, 11 insertions(+)

diff --git a/cookbook/c02/p05_search_replace.py b/cookbook/c02/p05_search_replace.py
index 4111f24..81aeaa1 100644
--- a/cookbook/c02/p05_search_replace.py
+++ b/cookbook/c02/p05_search_replace.py
@@ -20,6 +20,7 @@ def search_replace():
     # 复杂的模式，使用sub()
     text = 'Today is 11/27/2012. PyCon starts 3/13/2013.'
     print(re.sub(r'(\d+)/(\d+)/(\d+)', r'\3-\1-\2', text))
+    print(re.sub(r'(?P<month>\d+)/(?P<day>\d+)/(?P<year>\d+)', r'\g<year>-\g<month>-\g<day>', text))
 
     # 先编译
     datepat = re.compile(r'(\d+)/(\d+)/(\d+)')
diff --git a/source/c02/p05_search_and_replace_text.rst b/source/c02/p05_search_and_replace_text.rst
index b301f04..73cb589 100644
--- a/source/c02/p05_search_and_replace_text.rst
+++ b/source/c02/p05_search_and_replace_text.rst
@@ -42,6 +42,16 @@
     'Today is 2012-11-27. PyCon starts 2013-3-13.'
     >>>
 
+如果你使用了命名分组，那么第二个参数请使用 ``\g<group_name>`` ,如下
+
+.. code-block:: python
+
+    >>> text = 'Today is 11/27/2012. PyCon starts 3/13/2013.'
+    >>> import re
+    >>> re.sub(r'(?P<month>\d+)/(?P<day>\d+)/(?P<year>\d+)', r'\g<year>-\g<month>-\g<day>', text)
+    'Today is 2012-11-27. PyCon starts 2013-3-13.'
+    >>>
+
 对于更加复杂的替换，可以传递一个替换回调函数来代替，比如：
 
 .. code-block:: python