| 方法/属性 | 作用 |
| match() | 决定 RE 是否在字符串刚开始的位置匹配 |
| search() | 扫描字符串，找到这个 RE 匹配的位置 |
| findall() | 找到 RE 匹配的所有子串，并把它们作为一个列表返回 |
| finditer() | 找到 RE 匹配的所有子串，并把它们作为一个迭代器返回 |
import sys;
import re;
if __name__ == '__main__':
strVal = '''<a href="http://www.andylin02.com" target="_blank" class="dsdfv">aaaa</a>
<a href="http://www.congfeng.com" target="_blank" class="tdsfv">bbbbsdf</a>
<a href="http://www.st.com" target="_blank" class="txx">ccccccc</a>
<a href="http://www.qs.com" target="_blank" class="xxx">ddddd</a>
''';
print(strVal);
strPattern = r"(<\s*a\s.*href\s*=.*)";
#search
mtReSearch = re.search(strPattern,strVal);
print("======================= search result =======================");
print("%s ==> %d" %(mtReSearch.groups(),len(mtReSearch.groups()) ));
#findall
lsFind = re.findall(strPattern,strVal);
print("\n===================== findall result ========================");
print("%s ==> %d" %(lsFind,len(lsFind)));
#finditer
print("\n===================== finditer result =======================")
for mtFind in re.finditer(strPattern,strVal):
print(mtFind.groups());
print("------");结果：
>>>
<a href="http://www.andylin02.com" target="_blank" class="dsdfv">aaaa</a>
<a href="http://www.congfeng.com" target="_blank" class="tdsfv">bbbbsdf</a>
<a href="http://www.st.com" target="_blank" class="txx">ccccccc</a>
<a href="http://www.qs.com" target="_blank" class="xxx">ddddd</a>
======================= search result =======================
('<a href="http://www.andylin02.com" target="_blank" class="dsdfv">aaaa</a>',) ==> 1
===================== findall result ========================
['<a href="http://www.andylin02.com" target="_blank" class="dsdfv">aaaa</a>','<a href="http://www.congfeng.com" target="_blank" class="tdsfv">bbbbsdf</a>','<a href="http://www.st.com" target="_blank" class="txx">ccccccc</a>','<a href="http://www.qs.com" target="_blank" class="xxx">ddddd</a> '] ==> 4
===================== finditer result =======================
('<a href="http://www.andylin02.com" target="_blank" class="dsdfv">aaaa</a>',)
------
('<a href="http://www.congfeng.com" target="_blank" class="tdsfv">bbbbsdf</a>',)
------
('<a href="http://www.st.com" target="_blank" class="txx">ccccccc</a>',)
------
('<a href="http://www.qs.com" target="_blank" class="xxx">ddddd</a> ',)
------