Optional String Match in Python Regex

Question

I have a code in Python 2.7 which is used in finding information from a flight in a given piece of text. They always come grouped (operators have a standard format and just fill in the blanks and send the message)

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!!"

However I want to match

"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."

and also

"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."

How do I do it?

I cant match if there is "all new". So i wnat to change regex to match that — Prateek N
– Prateek N, Commented Jun 13, 2015 at 7:35
Just make it optional! within a none capturing group (?:all new)? — Kasravnd
– Kasravnd, Commented Jun 13, 2015 at 7:40

karthik manchala · Accepted Answer · 2015-06-13 07:36:30Z

1

Make all new optional with ?. Use the following::

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)

answered Jun 13, 2015 at 7:36

karthik manchala

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