Python - 在文件中查找特定字符串

Question

我尝试读取文件中的特定字符串。基本上文件看起来像这样:

S0M6A36A108A180A252A324A36|1|48|89|36|Single|
S0M6A36A108A180A252A324A36|2|43|83|108|Single|
S0M6A36A108A180A252A324A36|3|37|85|180|Single|
S0M6A36A108A180A252A324A36|4|37|93|252|Single|
S0M6A36A108A180A252A324A36|5|43|95|324|Single|
S0M6A36A108A180A252A324A36|6|42|89|36|Single|

[META DATA]
01/10/2015|14:50:27|USA|UWI_N2C34_2|MMS1|FORD35|Bednarek|true|6|0|false|

[QUALITY CAMERA CHECK]
1|1|0|
2|1|0|
3|1|0|
4|1|0|
5|1|0|
6|1|0|

[PRESET]
S0M6A36A108A180A252A324A36|TA|

我需要的是从以下行读取:01/10/2015|14:50:27|USA|UWI_N2C34_2|MMS1|FORD35|Bednarek|true|6|0|false|字符串 |USA|

之间的国家名称

为此，我尝试使用作为正则表达式一部分的函数组。我推断我需要从包含这个字符串的特定行中读取。所以我写了一小段代码:

import os
import string
import re
import sys
import glob
import fileinput

country_pattern = 'MYS','IDN','ZAF', 'THA','TWN','SGP', 'NWZ', 'AUS','ALB','AUT','BEL', 'BGR', 'BIH', 'CHE','CZE', 'DEU', 'DNK', 'ESP','EST','SRB','MDK','MNE','BIH', 'BIH','MNE','FIN', 'FRA', 'GBR','GRC', 'HRV', 'HUN', 'IRL', 'ITA', 'LIE', 'LTU', 'LUX', 'LVA', 'MDA', 'SMR','CYP','NLD','NOR','POL','PRT','ROU','SCG', 'SVK','SVN','SWE','TUR','BRA','CAN','USA','MEX','CHL','ARG','RUS'
pattern = r'(\d+)/(\d+)/(\d+)|(\d+):(\d+):(\d+)|(\S+)|(\S+)|(\S+)|(\S+)|(\S+)|(\S+)|(\d+)|(\d+)|(\S+)|'

src = raw_input("Enter source disk location: ")
src = os.path.dirname(src) 
for dir,_,_ in os.walk(src): 
    file_path = glob.glob(os.path.join(dir,"*.txt")) 
    for file in file_path:
    f = open(file, 'r')
    object_name = f.readlines()
    f.close()

    for line_name_tmp in object_name:
        line_name = line_name_tmp.replace('\n','')
        if line_name == '':
            line_name.split()
            continue
        else:
            try:
                searchObj = re.search(pattern, line_name)
                m = searchObj.group(7)
                if m in country_pattern:
                    print "searchObj.group(7) : ", searchObj.group(7)
                else:
                    print 'did not find any match'
            except:
                print line_name
                pass

但它总是会打印“没有找到任何匹配项”。我错过了什么 ？谢谢指教。

Answer 1

你的re是问题所在试试这个

pattern = r'(\d+)/(\d+)/(\d+)\|(\d+):(\d+):(\d+)\|(\S+)\|(\S+)\|(\S+)\|(\S+)\|(\S+)\|(\S+)\|(\d+)\|(\d+)\|(\S+)\|'