use Number::Phone::JP;
 
my $tel = Number::Phone::JP->new('012', '34567890');
print "This is valid!!\n" if $tel->is_valid_number;
 
$tel->set_number('098 7654 3210');
print "This is valid!!\n" if $tel->is_valid_number;
 
$tel->import(qw(mobile PHS));
$tel->set_number('090-0123-4567');
print "This is valid!!\n" if $tel->is_valid_number;

use Regexp::Assemble;
 
my $ra = Regexp::Assemble->new;
$ra->add( 'ab+c' );
$ra->add( 'ab+-' );
$ra->add( 'a\w\d+' );
$ra->add( 'a\d+' );
print $ra->re; # prints a(?:\w?\d+|b+[-c])