Re^2: How to replace envs in path?

Hi!
Thanks for the replay. I get a custom list of paths and I create a structure which represents the filesystem. I'm trying to support environment variables inside the list of paths so hence the question. Just want to support paths like $HOME/work_dir/${TOOL_NAME}/$VERSION.

Comment on Re^2: How to replace envs in path? Download Code

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Re^3: How to replace envs in path? by Don Coyote (Hermit) on May 09, 2022 at 13:54 UTC
the paths you do no want to expand are any where the scalar sigil `$` is not immediately after the filepath separator. In which case you can allow these by matching for that construct. `my $fps = 'filepathseparator'; m! $fps # your file path separator \Q$\E # quoted scalar sigil (shell variable expansion) \{? # start shelling out for a return value ? ([^\W]+) # your environment variable, not containing, # one or more non-word characters \}? # end shelling out for a return value ? !x` [download] This should match both cases where the curly braces are or are not used while constraining the variable to starting immediately after the file_path_separator (no mid/end word sigils match), and not allowing the path word to contain any non word characters.	[reply] [d/l] [select]

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Re^3: How to replace envs in path?
by Don Coyote (Hermit) on May 09, 2022 at 13:54 UTC

the paths you do no want to expand are any where the scalar sigil $ is not immediately after the filepath separator. In which case you can allow these by matching for that construct.

my $fps = 'filepathseparator';
m!
$fps             # your file path separator
\Q$\E            # quoted scalar sigil (shell variable expansion)
\{?              # start shelling out for a return value ?
([^\W]+)         # your environment variable, not containing,
                 # one or more non-word characters
\}?              # end shelling out for a return value ?
!x
[download]

This should match both cases where the curly braces are or are not used while constraining the variable to starting immediately after the file_path_separator (no mid/end word sigils match), and not allowing the path word to contain any non word characters.

[reply]
[d/l]
[select]