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my $fractionValue =
    ( $str =~ m{^(\d+)/([1-9]\d*)} )   # regex match will evaluate to 
+true or false
...
    :            # otherwise (if above condition was false), ...
    "undefined"  #   return this value
    ;            # end of statement

/blah/
m/blah/
m=blah=
m!blah!
m{blah}

/http:\/\/my\/path\/to\/insanity/
m{my/path/back/to/sanity}

$_ = "123.456/789-0";
if ( /(\d+)\D(\d+)\D(\d+)/ ) {
    printf( "Found three numbers: %d was between %d and %d\n", $2, $1,
+ $3 );
}

if ( $_ =~ /(\d+)\D(\d+)\D(\d+)/ ) { ...