The following works fine (on debian with perl 5.8.4) without the "use encoding" line but produces a segfault with it. Any ideas why? 
# cat > MyEncode.pm
package MyEncode;
my $re = '(?:\.|\.\.¦\/)';
sub test { return 1 if $_[0] =~ /^$re/;}
1;

# cat > MyEncode.pl
#!/usr/bin/perl -w
use strict;
use encoding 'latin2';
use MyEncode;
print "ok!" if MyEncode::test('./foo');

# ./MyEncode.pl

Compilation segmentation fault at ...

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UPDATE thanks to erix who pointed out that I should be using |, not ¦ in the regex. Problem goes away once that's fixed.

In reply to Segfault with "use encoding" by jZed

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