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> I'm afraid I'm not quite sure I understand, but does the following do what you mean by "extract a set of data"?

I think, you understand well.

> Lua 5.1.4  Copyright (C) 1994-2008, PUC-Rio
>> =("test a123a test"):match("a(%d+)a")
> 123

I want only this type of thing.
I hope it will serve my purpose.
Thanks a ton. :-)

Sandeep Ghai