How to fetch the first part of string from a whole lenghty string

Hi,
I have a data like - ex1:
  Auto Update : 10/04/2014 08:04  NEW data: xxxx OLD data: yyyy Ack - etr03 : 10/04/2014 08:13
 Auto Update : 10/04/2014 15:24  NEW data1 :xxx  OLD data1: yyyy Auto Update : 10/04/2014 09:36  NEW data1: xxx1 OLD data1: yyy1 Auto Update : 08/04/2014 12:28  NEW data1: xxx2 OLD data1: yyy2 Ack - jmi08 : 10/04/2014 09:53 Ack -
WWI13 : 10/04/2014 15:32
I want to compare only NEW data: xxxx OLD data: yyyy or  NEW data1 :xxx  OLD data1: yyyy Auto Update : 10/04/2014 09:36  NEW data1: xxx1 OLD data1: yyy1 Auto Update : 08/04/2014 12:28  NEW data1: xxx2 OLD data1: yyy2with the same ste
of value from another database but since I used substring I am getting even Ack - etr03 : 10/04/2014 08:13 value whose length changes for above 2 examples.
USed substring to get NEW data1 :xxx  OLD data1: yyyy Auto Update : 10/04/2014 09:36  NEW data1: xxx1 OLD data1: yyy1 Auto Update : 08/04/2014 12:28  NEW data1: xxx2 OLD data1: yyy2 
or
NEW data: xxxx OLD data: yyyy
but the ack part cannot be removed due to variable lenghts for each data hence could not compare this column between 2 databases. Any help would be highly appreciated.
Thanks,
Preetha

HI ,
THE INPUT IS
 EX 1:Auto Update : 10/04/2014 15:24  NEW data1 :xxx  OLD data1: yyyy Auto Update : 10/04/2014 09:36  NEW data1: xxx1 OLD data1: yyy1 Auto Update : 08/04/2014 12:28  NEW data1: xxx2 OLD data1: yyy2 Ack - jmi08 : 10/04/2014 09:53
Ack - WWI13 : 10/04/2014 15:32
EX 2: Auto Update : 10/04/2014 08:04  NEW data: xxxx OLD data: yyyy Ack - etr03 : 10/04/2014 08:13
AND THE EXPECTED RESULT IS :
EX1:NEW data1 :xxx  OLD data1: yyyy Auto Update : 10/04/2014 09:36  NEW data1: xxx1 OLD data1: yyy1 Auto Update : 08/04/2014 12:28  NEW data1: xxx2 OLD data1: yyy2
EX2 : NEW data: xxxx OLD data: yyyy
SINCE THE FILED LENGTH CHANGES I WANT TO WRITE A GENRIC QUERY WHICH FETCHES THE ABOVE DATA.I DO NOT WANT TO CREATE ANY TABLE
Hi Preetha7,
This make no sense. We cannot guess you database structure. 
Please post DDL (Create table script)
and DML (your current query)
and expected output.
For more info, please have a look at this thread:
POSTING TIPS - Code, Images, Hyperlinks, Details
Thanks!
sqldevelop.wordpress.com

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