regular expression help

What will be the regular expression to read following text file - I would like to make an array

Any text under [element] in one array
Any text under [Docs] in one array
Any text under [Indices.1] in one array
Any text under [Indices.2] in one array

[element]
Type=OU Document with type

[Docs]
1=\ft\ou\ds\comb\5623589556536.TIF
2=\ft\ou\ds\comb\5623589556586.TIF

[Indices.1]
account_number=9999999
first_name=test user
address=0
sub_class=OUT
linux_date=20000630
bentch_date=  /  /  
mod_acct_num=



[Indices.2]
account_number=9999999
first_name=test user
address=0
sub_class=OUT
linux_date=20000630
bentch_date=  /  /  
mod_acct_num=

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