use strict;

foreach ( "123  123 ", "1 1 ", "45 &45 " ) {
    print( "\"$_\"\n  " );
    if ( /^(\d+?) (.\1) / ) {
        printf( "Match 1 => \"%s\", Match 2 => \"%s\"\n",
                $1, $2 );
    } else {
        print( "No match\n" );
    }
}