python正则表达式笔记——匹配多行多段

场景分析

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使用python正则表达式提取某段中多行内容，例如：
‘’’
aaaa bbbb cccc
xx abcdefg
abcdefg
abc yy
abc abde adf
dadfeljgslka lkdsjgls
xx adgei ,
fdasd yy
adg asfgk ksdg
adsa xx
dga dgl yy
alkdg
‘’’
提取被xx和yy包围的字段

不使用compile

with open('./filename.txt', 'r') as f:
    content = f.read()
    import re
    re_str = r'xx.+yy'	# the resp will not include 'xx' and 'yy' if you use the 'xx(.+)yy'
    resp = re.findall(re_str, content, re.S)
    print resp

使用compile

with open('./filename.txt', 'r') as f:
    content = f.read()
    import re
    re_str = r'xx.+yy'	# the resp will not include 'xx' and 'yy' if you use the 'xx(.+)yy'
    comp = re.compile(re_str, re.S)
    resp = comp.findall(content)
    print resp