Thanks for the response L~R, Yes, this is Win32. I tried: 
print if /ATDT\d+.BUSY/s;
print if /ATDT\d+.*BUSY/s;
print if /ATDT\d+\r\nBUSY/m;

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and I'm still not matching. Something that I didn't mention in the first post, that I didn't feel was relevant, but maybe it is. In this file, each line ends with a ^M character (I forget what these are called, form feeds?), but when I print out the entire file in a while loop, they do not appear, so I figured they did not effect the regex or do they? If they did, then this one should still work print if /ATDT\d+.*BUSY/s; right?

In reply to Re^2: Regex Help by Dru
in thread Regex Help by Dru

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