howto simplfy this regex if ($string =~/^$match | $match | $match$/g){

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Hi,
How do I simplify the regex below so that it matches only the number 1, =
henceforth it should return false if I match $string with $match.

use strict;
use warnings;

my $string =3D "10 11 12 13 40";
my $match =3D 1;

if ($string =3D~/^$match | $match | $match$/g){
    print "match";
}else{
   print "unmatch";
};

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