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+======  Python正则表达式的用法 ======
+=====  字符串替换 =====
+==== 1.替换所有匹配的子串 ====
+用newstring替换subject中所有与正则表达式regex匹配的子串
+<code python>
+result, number = re.subn(regex, newstring, subject)
+</code>
+==== 2.替换所有匹配的子串（使用正则表达式对象） ====
+<code python>
+reobj = re.compile(regex)
+result, number = reobj.subn(newstring, subject)
+</code>
+===== 字符串拆分 =====
+==== 1.字符串拆分 ====
+<code python>
+result = re.split(regex, subject)
+</code>
+==== 2.字符串拆分（使用正则表示式对象） ====
+<code python>
+reobj = re.compile(regex)
+result = reobj.split(subject)
+</code>
+===== 匹配 =====
+下面列出Python正则表达式的几种匹配用法：
+==== 1.测试正则表达式是否匹配字符串的全部或部分 ====
+<code python>
+regex=ur"..." #正则表达式
+if re.search(regex, subject):
+    do_something()
+else:
+    do_anotherthing()
+</code>
+====  2.测试正则表达式是否匹配整个字符串 ====
+<code python>
+regex=ur"...\Z" #正则表达式末尾以\Z结束
+if re.match(regex, subject):
+    do_something()
+else:
+    do_anotherthing()
+</code>
+==== 3. 创建一个匹配对象，然后通过该对象获得匹配细节 ====
+<code python>
+regex=ur"..." #正则表达式
+match = re.search(regex, subject)
+if match:
+    # match start: match.start()
+    # match end (exclusive): match.end()
+    # matched text: match.group()
+    do_something()
+else:
+    do_anotherthing()
+</code>
+==== 4.获取正则表达式所匹配的子串 ====
+(Get the part of a string matched by the regex)
+<code python>
+regex=ur"..." #正则表达式
+match = re.search(regex, subject)
+if match:
+    result = match.group()
+else:
+    result = ""
+</code>
+==== 5. 获取捕获组所匹配的子串 ====
+(Get the part of a string matched by a capturing group)
+<code python>
+regex=ur"..." #正则表达式
+match = re.search(regex, subject)
+if match:
+    result = match.group(1)
+else:
+    result = ""
+</code>
+==== 6. 获取有名组所匹配的子串 ====
+(Get the part of a string matched by a named group)
+<code python>
+regex=ur"..." #正则表达式
+match = re.search(regex, subject)
+if match:
+    result = match.group("groupname")
+else:
+    result = ""
+</code>
+==== 7. 将字符串中所有匹配的子串放入数组中 ====
+(Get an array of all regex matches in a string)
+<code python>
+result = re.findall(regex, subject)
+</code>
+==== 8.遍历所有匹配的子串 ====
+(Iterate over all matches in a string)
+<code python>
+for match in re.finditer(r"<(.*?)\s*.*?/\1>", subject)
+    # match start: match.start()
+    # match end (exclusive): match.end()
+    # matched text: match.group()
+</code>
+==== 9.通过正则表达式字符串创建一个正则表达式对象 ====
+(Create an object to use the same regex for many operations)
+<code python>
+reobj = re.compile(regex)
+</code>
+==== 10.用法１的正则表达式对象版本 ====
+（use regex object for if/else branch whether (part of) a string can be matched）
+<code python>
+reobj = re.compile(regex)
+if reobj.search(subject):
+    do_something()
+else:
+    do_anotherthing()
+</code>
+==== 11.用法２的正则表达式对象版本 ====
+（use regex object for if/else branch whether a string can be matched entirely）
+<code python>
+reobj = re.compile(r"\Z")　＃正则表达式末尾以\Z 结束
+if reobj.match(subject):
+    do_something()
+else:
+    do_anotherthing()
+</code>
+====  12.创建一个正则表达式对象，然后通过该对象获得匹配细节 ====
+（Create an object with details about how the regex object matches (part of) a string）
+<code python>
+reobj = re.compile(regex)
+match = reobj.search(subject)
+if match:
+    # match start: match.start()
+    # match end (exclusive): match.end()
+    # matched text: match.group()
+    do_something()
+else:
+    do_anotherthing()
+</code>
+==== 13.用正则表达式对象获取匹配子串 ====
+（Use regex object to get the part of a string matched by the regex）
+<code python>
+reobj = re.compile(regex)
+match = reobj.search(subject)
+if match:
+    result = match.group()
+else:
+    result = ""
+</code>
+====  14.用正则表达式对象获取捕获组所匹配的子串 ====
+（Use regex object to get the part of a string matched by a capturing group）
+<code python>
+reobj = re.compile(regex)
+match = reobj.search(subject)
+if match:
+    result = match.group(1)
+else:
+    result = ""
+</code>
+====  15.用正则表达式对象获取有名组所匹配的子串 ====
+（Use regex object to get the part of a string matched by a named group）
+<code python>
+reobj = re.compile(regex)
+match = reobj.search(subject)
+if match:
+    result = match.group("groupname")
+else:
+    result = ""
+</code>
+==== 16.用正则表达式对象获取所有匹配子串并放入数组 ====
+（Use regex object to get an array of all regex matches in a string）
+<code python>
+reobj = re.compile(regex)
+result = reobj.findall(subject)
+</code>
+==== 17.通过正则表达式对象遍历所有匹配子串 ====
+（Use regex object to iterate over all matches in a string）
+<code python>
+reobj = re.compile(regex)
+for match in reobj.finditer(subject):
+    # match start: match.start()
+    # match end (exclusive): match.end()
+    # matched text: match.group()
+</code>

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