Regex replace uppercase with lowercase letters

Question

I\'m trying to replace uppercase letters with corresponding lowercase letters using regex. So that

EarTH:   1,
MerCury: 0.2408467,
venuS:   0.61519726,
         


        

Answer 1

In BBEdit works this (ex.: changing the ID values to lowercase):

Search any value: Replace with the same in lowercase:

Was: Became: