Add some regular expression note about html tag

crazyguitar · Mar 2, 2016 · 33f84ca · 33f84ca
1 parent d17db51
commit 33f84ca
Showing 1 changed file with 61 additions and 0 deletions.
diff --git a/docs/source/notes/python-rexp.rst b/docs/source/notes/python-rexp.rst
@@ -2,6 +2,67 @@
 Python Regular Expression cheatsheet
 ====================================
 
+Compare HTML tags
+-----------------
+
++------------+--------------+--------------+
+| tag type   | format       | example      |
++============+==============+==============+
+| all tag    | <[^>]+>      | <br />, <a>  |
++------------+--------------+--------------+
+| open tag   | <[^/>][^>]*> | <a>, <table> |
++------------+--------------+--------------+
+| close tag  | </[^>]+>     | </p>, </a>   |
++------------+--------------+--------------+
+| self close | <[^/>]+/>    | <br />       |
++------------+--------------+--------------+
+
+
+.. code-block:: python
+
+    # open tag
+    >>> re.search('<[^/>][^>]*>', '<table>') != None
+    True
+    >>> re.search('<[^/>][^>]*>', '<a href="#label">') != None
+    True
+    >>> re.search('<[^/>][^>]*>', '<img src="/img">') != None
+    True
+    >>> re.search('<[^/>][^>]*>', '</table>') != None
+    False
+
+    # close tag
+    >>> re.search('</[^>]+>', '</table>') != None
+    True
+
+    # self close
+    >>> re.search('<[^/>]+/>', '<br />') != None
+    True
+
+``re.findall()`` match string 
+-----------------------------
+
+.. code-block:: python
+
+    # split all string
+    >>> re.findall('[\w]+', source)
+    ['Hello', 'World', 'Ker', 'HAHA']
+
+    # parsing python.org website
+    >>> import urllib
+    >>> import re
+    >>> s = urllib.urlopen('https://www.python.org')
+    >>> html = s.read()
+    >>> s.close()
+    >>> print "open tags"
+    open tags
+    >>> re.findall('<[^/>][^>]*>', html)[0:2]
+    ['<!doctype html>', '<!--[if lt IE 7]>']
+    >>> print "close tags"
+    close tags
+    >>> re.findall('</[^>]+>', html)[0:2]
+    ['</script>', '</title>']
+    >>> print "self-closing tags"
+
 Group Comparison
 ----------------