fix(basic): Complex array for array definition should be allowed.

Fixes #9

Author: bruno-morel

test/specs/features/basic-scenarios.feature

@@ -20,3 +20,9 @@ Feature: Rocket Launching
     Then the rocket should end up in space
     And the booster(s) should land back on the launch pad
     But nobody should doubt me ever again
+
+  Scenario: Folding ourselves in 2D
+    Given I am Elon Musk attempting to launch a rocket into space
+    And  my position in 2D space is [ 0, 2 ]
+    When I launch the rocket
+    Then the rocket should end up in space

test/specs/features/step-definitions/basic-scenarios.steps.js

@@ -26,6 +26,13 @@ Then( 'the rocket should end up in space', () => {
     expect(rocket.isInSpace).toBe(true)
 } )
 
+/// Complex Regex :  at position (\[(?: *\d+(?: |, |,)*)+\]) with no value
+And( /^my position in 2D space is (\[(?: *\d+(?: |, |,)*)+\])$/, function( arrayPosition ) {
+    
+    const isAnArray = JSON.parse( arrayPosition )
+    expect( isAnArray ).toBeInstanceOf( Array )
+} )
+
 And( /^the booster\(s\) should land back on the launch pad$/, () => {
     expect(rocket.boostersLanded).toBe(true)
 } )