#!./perl use strict; use warnings; $|=1; use Scalar::Util (); use Test::More (grep { /isvstring/ } @Scalar::Util::EXPORT_FAIL) ? (skip_all => 'isvstring requires XS version') : (tests => 3); Scalar::Util->import(qw[isvstring]); my $vs = ord("A") == 193 ? 241.75.240 : 49.46.48; ok( $vs == "1.0", 'dotted num'); ok( isvstring($vs), 'isvstring'); my $sv = "1.0"; ok( !isvstring($sv), 'not isvstring');