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 @nonamesheep:

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

490 active golfers, 1497 entries

Solutions by @nonamesheep:
10
#66 - Herrington Darkholme / @nonamesheep

01/02/2014 at 05:56AM

10
#>66 - Herrington Darkholme / @nonamesheep

01/02/2014 at 05:58AM

11
#>202 - Herrington Darkholme / @nonamesheep

01/02/2014 at 05:55AM

12
#>292 - Herrington Darkholme / @nonamesheep

01/02/2014 at 05:54AM

13
#>358 - Herrington Darkholme / @nonamesheep

01/02/2014 at 05:53AM

15
#>423 - Herrington Darkholme / @nonamesheep

01/02/2014 at 04:58AM

17
#>442 - Herrington Darkholme / @nonamesheep

01/02/2014 at 04:55AM