RegEx replace with lowercased value

gistfile1.md

if you have a string like "6FA34323-C71F-4FD4-996F-002CE77E6B77"

search w/ regexp using ("[A-Z0-9-]+") replace with \L$1

\U will uppercase

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Vim version:

%s/\([A-Z0-9]\{8}\)-*\([A-Z0-9]\{4}\)-*\([A-Z0-9]\{4}\)-*\([A-Z0-9]\{4}\)-*\([A-Z0-9]\{12}\)/\L\1\2\3\4\5/gc