How would I Change a person's birthday with sed if I'm provided with just the name?

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okay the line i want to modify is Popeye's b-day and we have to do it by assuming the we don't know his b-day, here's what i did but it doesn't work.

sed '/Popeye/s/[0-9]/[0-9][0-9]/[0-9][0-9]/[1][1]/[1][4]/[4][6]' DDdatebook <---- don't work

Popeye Sailor:156-454-3322:945 Bluto Street, Anywhere, USA 29358:3/19/35:22350

asked 32 secs ago

Anthony Calma Ribao

4

How would I Change a person's birthday with sed if I'm provided with just the name?