Real Vim ninjas count every keystroke - do you?

Pick a challenge, fire up Vim, and show us what you got.

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$ gem install vimgolf
$ vimgolf setup
$ vimgolf put 52222f6ea98cbe0002000078

Letter case trickery

This file is in a downright esoteric format, consisting of hexadecimal numbers, non-hexadecimal keywords, and "Z" indicating end-of-line. Make the hexadecimal numbers lowercase.

Start file
A4E SUM 3C0Z
2B A9 NE F2Z
End file
a4e SUM 3c0Z
2b a9 NE f2Z

View Diff

1,2c1,2
< A4E SUM 3C0Z
< 2B A9 NE F2Z
---
> a4e SUM 3c0Z
> 2b a9 NE f2Z

Solutions by @chocola81394123:

Unlock 5 remaining solutions by signing in and submitting your own entry
Created by: @NbTson

497 active golfers, 1537 entries

Solutions by @chocola81394123:
9
#30 - chocolate / @chocola81394123

11/29/2020 at 09:45AM

10
#>160 - chocolate / @chocola81394123

11/29/2020 at 09:44AM

11
#>280 - chocolate / @chocola81394123

11/29/2020 at 09:43AM

12
#>347 - chocolate / @chocola81394123

11/29/2020 at 09:21AM

14
#>428 - chocolate / @chocola81394123

11/29/2020 at 09:20AM