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 @fredisrael:

Created by: @NbTson Tweet

511 active golfers, 1594 entries

Solutions by @fredisrael:

10

#93 - Fred Israel / @fredisrael

02/11/2014 at 08:18PM

11

#>226 - Fred Israel / @fredisrael

02/10/2014 at 08:37PM

11

#>226 - Fred Israel / @fredisrael

02/11/2014 at 08:16PM

12

#>315 - Fred Israel / @fredisrael

02/10/2014 at 08:35PM

12

#>315 - Fred Israel / @fredisrael

02/11/2014 at 08:16PM

13

#>381 - Fred Israel / @fredisrael

02/10/2014 at 08:32PM

14

#>418 - Fred Israel / @fredisrael

02/10/2014 at 08:32PM