cucumber expression assignment

I have an assignment on coursera to build regular expression (gherkin).

the following stepdefs.java is the code containing the regular expression which should be tested to cover the testfeature test scenarios. the grader gives me 9 out of 10 and states that there is a failing test scenario which should be passed.

stepdefs.java

package skeleton;
import cucumber.api.java.en.When;

public class Stepdefs {
    // NOTE: because the regular expressions are within 
    // Java strings, we have to make all backslashes double backslashes
    // for them to work correctly.  So, to find a decimal character,
    // rather than writing \d, you must write \\d. 

    // NOTE 2: to explicitly force a pattern to start with the 
    // beginning of the input string, start with ^.  To force it to 
    // end at the end of the input string, use $.  For example:
    // @When("test_foo \\d") will match:
    //     test_foo 5
    // but will also match:
    //     some test_foo 5 dollars
    //     bugga bugga test_foo 1 
    // 
    // On the other hand:
    // @When("^test_foo \\d$")
    // will only match: test_foo 5
    // 
    
    // NOTE 3: to not 'capture' a pattern as an argument to the 
    // Java method, use (?:<pattern>)
    // For example: 
    //    @When("^match_four ((in|out)(foo|bar))$") 
    // will match the words:
    //   infoo, inbar, outfoo, and outbar.  
    // However, the associated Java function will require three 
    // parameters: one for the 'in/out' value, one for the 
    // 'foo/bar' value, and one for their concatenation.  To 
    // only capture the concatenated value, use: 
    //   @When("^match_four ((?:in|out)(?:foo|bar))$")
    // 
    // You will probably need this to do the IP address example :)
    
    
    // Regular expression matcher for positive integers
    // Should match the string: test_posint followed by an sequence of 
    // digits of arbitrary length 
    @When("^test_posint\\s*(\\d+)$")
    public void test_posint(int number) throws Throwable {
        System.out.println("test_posint true for: " + number);
    }
    
    // Regular expression matcher for integers
    // Should match the string: test_int followed by an optional
    // minus sign followed by a sequence of 
    // digits of arbitrary length 
    //
    // I give you this one as a freebie!
    @When("^test_int\\s*(-?\\d+)$")
    public void test_int(int arg1) throws Throwable {
        System.out.println("test_int true for: " + arg1);
    }

    // Regular expression matcher for floats
    // Should match the string: test_float followed by an optional
    // minus sign followed by a sequence of 
    // digits of arbitrary length followed by a period followed by
    // a second sequence of digits of arbitrary length.
    @When("^test_float\\s*-?(\\d+\\.+\\d+$)")
    public void test_float(float arg1) throws Throwable {
        System.out.println("test_int true for: " + arg1);
    }
    
    // Regular expression matcher for IP addresses (though inexact).
    // It should accept four digit sequences separated by periods
    // where a digit sequence is defined as follows:
    //    Any single digit
    //    Any two digit characters if the first character is non-zero
    //    A one followed by a zero, one, or two followed by any digit
    
    // SEE NOTE 3 :)
    @When("^test_ip_address\\s*((?:(?:(?:\\d)|(?:1[0-2]\\d)|(?:[1-9]\\d))\\.){3}(?:(?:\\d)|(?:[1-9]\\d)|(?:1[0-2]\\d)))$")
    public void test_ip_address(String arg1) throws Throwable {
        System.out.println("test_ip_address true for: " + arg1);
    }

    
    // Pattern distinguisher.  
    // Should match the string starting with: test_splitter arg
    // Where <arg> should match the following positive examples
    // and not the negative examples.  Note: any string not in the 
    // positive or negative examples can be accepted or rejected.
    // 
    // Positive:        Negative:
    // =========        =========
    // spill            si
    // Sponge           egregious
    // tap              Foul
    // rebuild          Test
    //                  top
    //                  ta
    @When("^test_splitter\\s*(?=.*?\\bspill|Sponge|tap|rebuild\\b)((?!si|egregious|Foul|Test|ta).)*$")
    public void test_splitter(String match) throws Throwable {
        System.out.println("test_splitter true for: " + match);
    }
    
    
    // Pattern distinguisher 2.  
    // Should match the string starting with: test_splitter2 arg
    // Where <arg> should match the following positive examples
    // and not the negative examples.  Note: any string not in the
    // positive or negative examples can be accepted or rejected.
    // 
    // Positive:        Negative:
    // =========        =========
    // spill            spall
    // Sponge           egregious
    // tap              foul
    // rebuild          test
    //                  top
    //                  tapper
    @When("^test_splitter2\\s*(?=.*?\\bspill|Sponge|tap|rebuild\\b)((?!spall|egregious|foul|Test|top|tapper).)*$")
    public void test_splitter2(String match) throws Throwable {
        System.out.println("test_splitter2 true for: " + match);
    }
}

testfeature

Scenario: test regular expressions that should pass
    When test_posint 12345
    When test_posint 9
    When test_posint 77777777
    When test_int -1
    When test_int 1435
    When test_float 12345.543
    When test_float -13.56
    When test_ip_address 123.34.76.109
    When test_ip_address 123.34.76.109
    When test_ip_address 105.22.33.44
    When test_ip_address 1.2.3.4
    When test_splitter spill
    When test_splitter Sponge
    When test_splitter tap
    When test_splitter rebuild
    When test_splitter2 spill
    When test_splitter2 Sponge
    When test_splitter2 tap
    When test_splitter2 rebuild
  
  Scenario: fail 1
    When test_int 5y6
  Scenario: fail 2
    When test_int 56k
  Scenario: fail 3
    When test_int 57.45
  Scenario: fail 4
    When test_float 1235
  Scenario: fail 5
    When test_int 46 and more
  Scenario: fail 6
    When test_float 3.45 and more
  Scenario: fail 7
    When test_ip_address 123.45.47
  Scenario: fail 8
    When test_ip_address four score and 123.34.76.109
  Scenario: fail 9
    When test_ip_address 123.34.76.109 and more