Merge pull request yidao620c#303 from ronghuaxueleng/master

yidao620c · web-flow · commit 01d3afe4af60 · 2019-10-24T11:45:57.000+08:00
第二章第五节搜索和替换中补充命名分组的替换写法
diff --git 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
@@ -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
