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import re
s='<title>http://www.baidu.com</title>'
print re.findall(r'<\w+>(.+)</',s)
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>>>
['http:\\www.baidu.com']
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import re
s='<head><title>http:\\www.baidu.com</title></head>'
print re.findall(r'title>(.+)</title',s)
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>>>
['http:\\www.baidu.com']
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import re
s='zhuangruln@gmail.com  zhuangasdsad@126.com zhusdandsai@adsd'
print re.findall(r'(\w+@\w+\.\w+)',s)
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['zhuangruln@gmail.com', 'zhuangasdsad@126.com']
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eat python 003

Documentation for C's fopen():
---
r Open text file for reading. The stream is positioned at the beginning
of the file.
r+ Open for reading and writing. The stream is positioned at the
beginning of the file.
w Truncate file to zero length or create text file for writing. The
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