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> ',) ------
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