parse a file

Hi,

we have a tool and when we run it, its output is like the following.  Now what I need to get is the list of all the strings just before the word [Group]. So the output of parsing the following file should be like this. And the output can be variable I mean it should go through the entire file and look for the string [Group]. Hope I am clear enough

MI_AP_L2_NRRT
MI_AP_L2_RRT
MI_AP_NL2_NRRT
MI_EU_CapacityPlanning

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2/4/2008 9:37:55 AM   Version: 8.1.0 (Build 8.1.000.149)
2/4/2008 9:37:55 AM   Project Source: 1-DEV (SMFIMDMSI01)
2/4/2008 9:37:55 AM   Login: administrator
2/4/2008 9:37:55 AM   Executing task(s)...
2/4/2008 9:37:55 AM   Members = MI_AP_L2_NRRT [Group], MI_AP_L2_RRT [Group], MI_AP_NL2_NRRT [Group], MI_AP_NL2_RRT [Group]
2/4/2008 9:37:55 AM   Members = MI_EU_CapacityPlanning [Group], MI_EU_L2_NRRT [Group], MI_EU_L2_RRT [Group], MI_EU_NL2_NRRT [Group]
2/4/2008 9:37:55 AM   Members = MI_EU_NL2_RRT [Group], MI_NA_BIDeveloper [Group], MI_NA_L2_NRRT [Group], MI_NA_L2_RRT [Group]
2/4/2008 9:37:55 AM   Members = MI_NA_NL2_NRRT [Group], MI_NA_NL2_RRT [Group], MI_Others [Group], MI_OthersL2 [Group]
2/4/2008 9:37:55 AM   Task(s) execution completed successfully.