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I am using grep to extract the expiration date from a WHOIS record. The command line I use is:

whois -H domainname.com | grep -m 1 'Expir'

and I get what I need, i.e. the line with the first match containing 'Expir'. However, I would like to trim this output and get only the date, i.e. xxxx-xx-xx.

Currently, the output looks like this:

   Registry Expiry Date: 2018-01-23T16:07:52Z

There are extra characters after the date, delimited by the character T, as well as extra characters before the date. How can I eliminate all those and keep the date only?

Thanks

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$ whois -H google.com | grep -oP 'Expiry Date: \K.*(?=T)'
2020-09-14
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    Perfect! Thanks a lot. I don't understand any of it, but it works :) – Tocell Nov 8 '17 at 5:27

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