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shell or perl script using grep and regex

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# 1  
shell or perl script using grep and regex


I have file stored in a directory containing information about subnet mask and next hop address in the following format,,,,

here represent range of ip address

given say an IP address I need to write a script to get sub net Mask and next hop. What is the best way using grep and regex
# 2  
regexes cannot understand ip/subnet ranges because they have no concept of numbers, let alone arithmetic.

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In sed, the REGEX caret (^) matches the end of the line.
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