OK, I shortened it, hope this is more acceptable. In the process I discovered, as I suspected, that it has something to do with the regex order, but exactly what is still pretty opaque to me.
#!/usr/bin/perl
my @words = ('aa', 'as', 'es', 'is', 'os', 'sh', 'si', 'so');
print "WORDS: @words\n";
print "----------------------------\n";
my $regex = ".?a?";
print "Matches for regex pattern : $regex\n\n";
foreach (@words) {
if(join('', sort split //, $_) =~ /^$regex$/) {
print "$_\n";
}
}
print "----------------------------\n";
my $regex = "a?.?";
print "Matches for regex pattern : $regex\n\n";
foreach (@words) {
if(join('', sort split //, $_) =~ /^$regex$/) {
print "$_\n";
}
}
print "----------------------------\n";
$regex = "s?.?";
print "Matches for regex pattern : $regex\n\n";
foreach (@words) {
if(join('', sort split //, $_) =~ /^$regex$/) {
print "$_\n";
}
}
print "----------------------------\n";
$regex = ".?s?";
print "Matches for regex pattern : $regex\n\n";
foreach (@words) {
if(join('', sort split //, $_) =~ /^$regex$/) {
print "$_\n";
}
}
print "----------------------------\n";
OUTPUT
WORDS: aa as es is os sh si so
----------------------------
Matches for regex pattern : .?a?
aa
----------------------------
Matches for regex pattern : a?.?
aa
as
----------------------------
Matches for regex pattern : s?.?
----------------------------
Matches for regex pattern : .?s?
as
es
is
os
sh
si
so
----------------------------
Regards.
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