upper- to lower-case using sed

Question

I\'d like to change the following patterns:

getFoo_Bar

to:

getFoo_bar

(note the lower b)

Knowing

Answer 1

You can use perl for this one:

perl -pe 's/(get[A-Z][A-Za-z0-9]*)_([A-Z])/\1_\l\2/'

The \l is the trick here.

sed doesn't do upper/lowercase on matched groups.