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grep -Pno "[[[:alnum:]]*]\(.*?\)" /path/to/file.md 

OR even better( this would match even ["foo anotherword"])

grep -Pno "\[([[:alnum:]]*[[:space:]]*)*?\]\(.*?\)" 

-P => Perl Regex which is used to match non-greedy using ?

grep -Pno "[[[:alnum:]]*]\(.*?\)" /path/to/file.md 

OR even better( this would match even ["foo anotherword"])

grep -Pno "\[([[:alnum:]]*[[:space:]]*)*?\]\(.*?\)" 

-P => Perl Regex which is used to match non-greedy using ?

OR if don't want only alpha numeric and space but any character means

 grep -Pno "\[.*?\]\(.*?\)" 

grep -Pno "[[[:alnum:]]*]\(.*?\)" /path/to/file.md 

OR even better( this would match even ["foo anotherword"])

grep -Pno "\[[[:print:]]*?\]\(.*?\)" /path/to/file.md 

-P => Perl Regex which is used to match non-greedy using ?

grep -Pno "[[[:alnum:]]*]\(.*?\)" /path/to/file.md 

OR even better( this would match even ["foo anotherword"])

grep -Pno "\[([[:alnum:]]*[[:space:]]*)*?\]\(.*?\)" 

-P => Perl Regex which is used to match non-greedy using ?

grep -Pno "[[[:alnum:]]*]\(.*?\)" /path/to/file.md 

OR even better( this would match even ["foo anotherword"])

grep -Pno "\[.*?\]\(.*?\)" /path/to/file.md 

-P => Perl Regex which is used to match non-greedy using ?

grep -Pno "[[[:alnum:]]*]\(.*?\)" /path/to/file.md 

OR even better( this would match even ["foo anotherword"])

grep -Pno "\[[[:print:]]*?\]\(.*?\)" /path/to/file.md 

-P => Perl Regex which is used to match non-greedy using ?