--- /dev/null
+#!/usr/bin/perl -w
+
+BEGIN {
+ if( $ENV{PERL_CORE} ) {
+ chdir 't';
+ @INC = ('../lib', 'lib');
+ }
+ else {
+ unshift @INC, 't/lib';
+ }
+}
+
+use strict;
+use Test::More tests => 16;
+
+use Test::Builder;
+my $Test = Test::Builder->new;
+
+my $r = $Test->maybe_regex(qr/^FOO$/i);
+ok(defined $r, 'qr// detected');
+ok(('foo' =~ /$r/), 'qr// good match');
+ok(('bar' !~ /$r/), 'qr// bad match');
+
+SKIP: {
+ skip "blessed regex checker added in 5.10", 3 if $] < 5.010;
+
+ my $obj = bless qr/foo/, 'Wibble';
+ my $re = $Test->maybe_regex($obj);
+ ok( defined $re, "blessed regex detected" );
+ ok( ('foo' =~ /$re/), 'blessed qr/foo/ good match' );
+ ok( ('bar' !~ /$re/), 'blessed qr/foo/ bad math' );
+}
+
+{
+ my $r = $Test->maybe_regex('/^BAR$/i');
+ ok(defined $r, '"//" detected');
+ ok(('bar' =~ m/$r/), '"//" good match');
+ ok(('foo' !~ m/$r/), '"//" bad match');
+};
+
+{
+ my $r = $Test->maybe_regex('not a regex');
+ ok(!defined $r, 'non-regex detected');
+};
+
+
+{
+ my $r = $Test->maybe_regex('/0/');
+ ok(defined $r, 'non-regex detected');
+ ok(('f00' =~ m/$r/), '"//" good match');
+ ok(('b4r' !~ m/$r/), '"//" bad match');
+};
+
+
+{
+ my $r = $Test->maybe_regex('m,foo,i');
+ ok(defined $r, 'm,, detected');
+ ok(('fOO' =~ m/$r/), '"//" good match');
+ ok(('bar' !~ m/$r/), '"//" bad match');
+};