How to convert this data?

[Fixer]

Hi,
please help mi with this...
I'll trying convert this data using Perl pattern (unsuccessfully).

simple data to convert:
============SIMPLE DATA BEGIN============
[a]aaa[/a]
[something_c]ccc[/something_c]
[e]eee[/e]
[more_f]fff[/more_f]
[g]ggg[/g]
============SIMPLE DATA END============

after convertion:
============RESULT DATA BEGIN============
aaa||ccc||eee|fff|ggg
============RESULT DATA end============

I have problem with parsing parameters "" and "[D]", could you help me?

THX for helping...

PS.TextPipe 7.x