I got a file which includes many lines of plain utf-8 text. Such as below, by the by, it's Chinese.
PROCESS:类型:关爱积分[NOTIFY] 交易号:2012022900000109 订单号:W12022910079166 交易金额:0.01元 交易状态:true 2012-2-29 10:13:08
The file itself was saved in utf-8 format. file name is xx.txt
here is my python code, env is python2.7
#coding: utf-8
import re
pattern = re.compile(r'交易金额:(\d+)元')
for line in open('xx.txt'):
match = pattern.match(line.decode('utf-8'))
if match:
print match.group()
The problematic thing here is I got no results.
I wanna get the decimal string from 交易金额:0.01元
, in here, which is 0.01
.
Why doesn't this code work? Can anyone explain it to me, I got no clue whatsoever.
There are several issues with your code. First you should use re.compile(ur'<unicode string>')
. Also it is nice to add re.UNICODE flag (not sure if really needed here though). Next one is that still you will not receive a match since \d+
doesn't handle decimals just a series of numbers, you should use \d+\.?\d+
instead (you want number, probably a dot and a number). Example code:
#coding: utf-8
text = u"PROCESS:类型:关爱积分[NOTIFY] 交易号:2012022900000109 订单号:W12022910079166 交易金额:0.01元 交易状态:true 2012-2-29 10:13:08"
import re
pattern = re.compile(ur'交易金额:(\d+\.?\d+)元', re.UNICODE)
print pattern.search(text).group(1)
You need to use .search()
since .match()
is like starting your regex with ^
, i.e. it only checks at the beginning of the string.
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