doc: Clarify substitute* docstring with an example.

* doc/guix.texi (Build Utilities): Update the corresponding passage.

Co-authored-by: Ludovic Courtès <ludo@gnu.org>
This commit is contained in:
Gabriel Wicki 2023-04-13 10:31:57 +02:00 committed by Ludovic Courtès
parent 61031dd32f
commit 199218e372
No known key found for this signature in database
GPG key ID: 090B11993D9AEBB5

View file

@ -10379,7 +10379,9 @@ Alternatively, @var{file} may be a list of file names, in which case
they are all subject to the substitutions.
Be careful about using @code{$} to match the end of a line; by itself it
won't match the terminating newline of a line.
won't match the terminating newline of a line. For example, to match a
whole line ending with a backslash, one needs a regex like
@code{"(.*)\\\\\n$"}.
@end defmac
@subsection File Search