my $string = "Field1: one";
foreach my $reobj ( qr/Field1/, qr/Field2/, qr/Field3/) {
print "$1\n" if $string =~ m/$reobj: (\w{3})/;
}
Basically you can take advantage of the aliasing feature of foreach loops to help in creating your multiple re's. Another alternative would be simple alternation.
Update: To more specifically address your question, there's no reason why you couldn't put the regular expressions into an array like this:
my $string = "Field1: one";
my @regexobjs = ( qr/Field1/, qr/Field2/, qr/Field3/ );
foreach my $reobj ( @regexobjs ) {
# The rest is the same as above.....
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