On Wed, Sep 27, 2023 at 4:50 AM 'c.willis111' via vim_use <
vim_use@googlegroups.com> wrote:

>
> ------ Original Message ------
> From: "Igor" <igo...@gmail.com>
> To: "vim_use" <vim_use@googlegroups.com>
> Sent: Wednesday, 27 Sep, 2023 At 12:09
> Subject: Replace spaces with underscore after some pattern in line
>
> How to replace all of the spaces in each line after XXX string?
>
> Input sample data:
> aaaaaa bbbbbb cccc XXX aaaaa bbbbbbb
> cccccccc eeeeeeeeee XXX aaa bbbb cccc ddd
> aaaa bbbb ddd ee XXX aaa bbb dddd eee
>
> Output sample data:
> aaaaaa bbbbbb cccc XXX_aaaaa_bbbbbbb
> cccccccc eeeeeeeeee XXX_aaa_bbbb_cccc_ddd
> aaaa bbbb ddd ee XXX aaa_bbb_dddd_eee
>
>
Zero width patterns are helpful here. Try,

:%s/\(XXX.*\)\@<=\s/_/g

Here, the expression says, any whitespace (\s) that is preceded by "XXX.*"
be replaced with "_".

:help \@<=

Regards,
-Arun

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