17-19,结论:对于unicode字符串,要用unicode正则字符串查找,unicode正则字符串的构成有两个要件,一是字符串本身由unicode字符构成,二是用'u'引导(python2);
20-23,结论:对于str字符串,要用二进制正则字符串查找,用'r'引导,如果用'u'引导,因为并不包含unicode字符,其实际上不起作用,相当于'r';
In [17]: %paste
import re
html = u"abcd 32人喜欢 efgh"
html = re.sub(ur'(d+)u4ebau559cu6b22', r'<div class="like">1</div>', html)
print html
## -- End pasted text --
abcd <div class="like">32</div> efgh
In [18]: %paste
import re
html = u"abcd 32人喜欢 efgh"
html = re.sub(r'(d+)u4ebau559cu6b22', r'<div class="like">1</div>', html)
print html
## -- End pasted text --
abcd 32人喜欢 efgh
In [19]: %paste
import re
html = u"abcd 32人喜欢 efgh"
html = re.sub(r'(d+)xe4xbaxbaxe5x96x9cxe6xacxa2', r'<div class="like">1</div>', html)
print html
## -- End pasted text --
abcd 32人喜欢 efgh
In [20]: %paste
import re
html = "abcd 32人喜欢 efgh"
html = re.sub(r'(d+)u4ebau559cu6b22', r'<div class="like">1</div>', html)
print html
## -- End pasted text --
abcd 32浜哄枩娆?efgh
In [21]: %paste
import re
html = "abcd 32人喜欢 efgh"
html = re.sub(ur'(d+)u4ebau559cu6b22', r'<div class="like">1</div>', html)
print html
## -- End pasted text --
abcd 32浜哄枩娆?efgh
In [22]: %paste
import re
html = "abcd 32人喜欢 efgh"
html = re.sub(r'(d+)xe4xbaxbaxe5x96x9cxe6xacxa2', r'<div class="like">1</div>', html)
print html
## -- End pasted text --
abcd <div class="like">32</div> efgh
In [23]: %paste
import re
html = "abcd 32人喜欢 efgh"
html = re.sub(ur'(d+)xe4xbaxbaxe5x96x9cxe6xacxa2', r'<div class="like">1</div>', html)
print html
## -- End pasted text --
abcd <div class="like">32</div> efgh