Unix: sed (or awk): print captured group or placeholder if it doesn't exist

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Peter Schneider
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sed (or awk): print captured group or placeholder if it doesn't exist
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(unix.stackexchange.com/users/635427/mister-smith)Mister Smith
(unix.stackexchange.com/users/119298/meuh)meuh
(unix.stackexchange.com/users/100397/chris-davies)Chris Davies
(unix.stackexchange.com/users/70524/muru)muru
(unix.stackexchange.com/users/112566/toby-speight)Toby Speight
(unix.stackexchange.com/users/133219/ed-morton)Ed Morton
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