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 @I_haveno_name:

Unlock 7 remaining solutions by signing in and submitting your own entry
Created by: @NbTson

498 active golfers, 1547 entries

Solutions by @I_haveno_name:
11
#193 - hiding / @I_haveno_name

10/02/2013 at 08:24PM

12
#>290 - hiding / @I_haveno_name

10/02/2013 at 08:23PM

13
#>357 - hiding / @I_haveno_name

10/02/2013 at 08:22PM

14
#>401 - hiding / @I_haveno_name

10/02/2013 at 08:19PM

14
#>401 - hiding / @I_haveno_name

10/02/2013 at 08:21PM

16
#>438 - hiding / @I_haveno_name

10/02/2013 at 08:17PM

18
#>462 - hiding / @I_haveno_name

10/02/2013 at 08:11PM