perl one liner to search for a pattern
===

I have a text file like

    Hi
    how are you
    <blank>
    <blank>
    abcd
    <blank>
    defgh
    opqr
    <blank>
I want to print all lines that have the pattern like "some text"blankblank"some text"
like 

    how are you
    <blank>
    <blank>
    abcd
I am thinking about using join and then search for the pattern. But I am not sure how to do it. (By blank I mean empty line)



