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Any Idea why it doesn't substitute in command line?
It's still reading one line at a time, using newlines or whatever for the line separators. Try clearing the input record separator or else assigning it to null or something strange:
Any Idea why it doesn't substitute in command line?
The answer to the question you've asked is that you're trying to use a multi-line pattern but are splitting the input on newlines.
In Perl you can use -0 (that's zero, not O) to change the delimiters to ASCII NUL character instead of newline, and thus treat the entire input as a single record.
Adding that would make your pattern work, but I recommend removing/ignoring carriage returns to simplify things, and being either more flexible with your non-relevant lines, or more explicit. Also, you were missing the ^$ bounds that make the m flag useful, and only need g flag if there could be multiple instances to replace, so...
Assuming that this is not a one-off, and going with syg00's comment about 'readability', which I totally agree with, frankly I'd actually write a short Perl program instead.
The result would be much more readable / maintainable.
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