In your regex you could specify
\n to indicate a newline. (Play with this; your file might contain
\r or a control-character as a line separator.)
So, for example, you could have
if /.+FIRST.+\n.+SECOND.+\n.+THIRD.+\n.+FOURTH/
which would only match a string spanning four lines, the first containing FIRST, the second containing SECOND, etc.
This is my first attempt at helping out, so I apologize in advance. 8-)
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