You cannot declare the two @regexes arrays in different scopes and then use them later. A variable declared with my only lasts up to the end of the enclosing block.

You can declare the variable before the condition and only populate it depending on it: 

my @regexes;
if ($param eq 'mod') {
    @regexes = ...
} else {
    @regexes = ...
}

[download]
or you can use the conditional operator (the "ternary"), shown below.

To match the entities involved in ;\s&, you need to extend the regex: 

&[^;]+;\s&[^;]+;

[download]
i.e. an ampersand, not semicolon at least once, semicolon, space, and an entity again.

Here's a complete example. Running it with script.pl 1.xml searches for the original regexes, specifyin any true parameter (e.g. script.pl 1.xml 1) after the file uses the modified regexes. I also added the grouping parentheses to the matching and $1 to the output to show which part of the string actually matched the regex. 

#!/usr/bin/perl
use warnings;
use strict;

my ($infile, $param) = @ARGV;
my @regexes = $param ? (qr/&[^;]+;\s&[^;]+;/)
                     : (qr/–§/,
                        qr/–Ü/,
                        qr/ߧ/);

open my $in, '<', $infile or die "Cannot open $infile for reading: $!"
+;

my $xml;
{
    local $/;
    $xml = <$in>;
}

open my $out, '>', 'pairs.txt' or die $!;

print {$out} "Find pair of entities without/with separating space\n\ni
+nput file: ";
print {$out} "$infile";
print {$out} "\n======================================================
+==================\n\n";

for my $i (0 .. $#regexes) {
    my $regex = $regexes[$i];
    $regex =~ s/^\(\?\^://;
    $regex =~ s/\)$//;
    print {$out} "$regex: $1\n" while $xml =~ /($regex)/g;
 }

close $in;
close $out;

[download]
Update: Fixed formatting, thanks Discipulus.

map{substr$_->[0],$_->[1]||0,1}[\*||{},3],[[]],[ref qr-1,-,-1],[{}],[sub{}^*ARGV,3]

In reply to Re: Output minimal occurrences of matching regex(es) by choroba
in thread Output minimal occurrences of matching regex(es) by LexPl

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