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doc: Clarify substitute* docstring with an example.
* doc/guix.texi (Build Utilities): Update the corresponding passage. Co-authored-by: Ludovic Courtès <ludo@gnu.org>
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@ -10379,7 +10379,9 @@ Alternatively, @var{file} may be a list of file names, in which case
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they are all subject to the substitutions.
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Be careful about using @code{$} to match the end of a line; by itself it
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won't match the terminating newline of a line.
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won't match the terminating newline of a line. For example, to match a
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whole line ending with a backslash, one needs a regex like
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@code{"(.*)\\\\\n$"}.
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@end defmac
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@subsection File Search
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