Python Regex中可选的字符串匹配

Question

我在python2.7中有一个代码，用于在给定的文本中查找航班信息。他们总是分组（操作员有一个标准格式，只需填写空格并发送消息）

import re

line = "JetMobile:Your flight 9W448 on 14Jan2015 is expected to leave BLR at 19:00 hrs, reach BOM at 20:42 hrs. Download our Mobile App from http://m.jetairways.com/mobileapps for booking(s), flight status, check-in and more."

matchObj = re.match( r'JetMobile\:Your flight (.*?) on (.*?) is expected to leave (.*?) at (.*?) hrs, reach (.*?) at (.*?) hrs\. Download our Mobile App from (.*?) for booking\(s\), flight status, check-in and more\.', line, re.M|re.I)

if matchObj:
   print "matchObj.group() : ", matchObj.group()
   print "matchObj.group(1) : ", matchObj.group(1)
   print "matchObj.group(2) : ", matchObj.group(2)
   print "matchObj.group(3) : ", matchObj.group(3)
else:
   print "No match!!"

但是我想匹配

^{pr2}$

还有

"JetMobile:Your flight 9W448 on 14Jan2015 is expected to leave BLR at 19:00 hrs, reach BOM at 20:42 hrs. Download our all new Mobile App from http://m.jetairways.com/mobileapps for booking(s), flight status, check-in and more."

我该怎么做？在

Answer 1

使all new与?可选。使用以下命令：

matchObj = re.match( r'JetMobile\:Your flight (.*?) on (.*?) is expected to leave (.*?) at (.*?) hrs, reach (.*?) at (.*?) hrs\. Download our (?:all new )?Mobile App from (.*?) for booking\(s\), flight status, check-in and more\.', line, re.M|re.I)