G'day fasoli,

TMTOWTDI

An array variable in a quoted (interpolated quotes) string will, by default, add spaces between the elements when interpolated. See 'perlvar: $"' for details. 

$ perl -E 'my @x = (1,2,3); say ">@x<"'
>1 2 3<

[download]

If you get your captures into an array, i.e. ($1,$2,$3), they too will output with spaces separating the elements.

You can do it like this: 

$ perl -E 'my @x = "1.234 5.6789 -1.235" =~ /(-?\d+?\.?\d+)/g; say "@x
+"'
1.234 5.6789 -1.235

$ perl -E 'my @x = "1.234 5.6789-12.235" =~ /(-?\d+?\.?\d+)/g; say "@x
+"'
1.234 5.6789 -12 235

[download]

Perl v5.26 introduced some new special variables to handle this sort of thing for you (see "perldelta: @{^CAPTURE}, %{^CAPTURE}, and %{^CAPTURE_ALL}"). Using @{^CAPTURE} removes the need for an intermediate variable. Here's a couple of quick examples with your posted data: 

$ perl -E '"1.234 5.6789 -1.235" =~ /^(-?\d+?\.?\d+)\s*(-?\d+?\.?\d+)\
+s*(-?\d+?\.?\d+)$/; say "@{^CAPTURE}"'
1.234 5.6789 -1.235

$ perl -E '"1.234 5.6789-12.235" =~ /^(-?\d+?\.?\d+)\s*(-?\d+?\.?\d+)\
+s*(-?\d+?\.?\d+)$/; say "@{^CAPTURE}"'
1.234 5.6789 -12.235

[download]

— Ken

In reply to Re: match digit, followed by hyphen, followed again by digit - then add whitespaces and replace in file by kcott
in thread match digit, followed by hyphen, followed again by digit - then add whitespaces and replace in file by fasoli

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