{"bc", "ab", -1},
	{"ab", "ab", 0},
	{"xab", "ab", 1},
	{"xab"[:2], "ab", -1},
	{"", "abc", -1},
	{"xbc", "abc", -1},
	{"abc", "abc", 0},
	{"xabc", "abc", 1},
	{"xabc"[:3], "abc", -1},
	{"xabxc", "abc", -1},
	{"", "abcd", -1},
	{"xbcd", "abcd", -1},
	{"abcd", "abcd", 0},
	{"xabcd", "abcd", 1},
	{"xyabcd"[:5], "abcd", -1},
	{"xbcqq", "abcqq", -1},
	{"abcqq", "abcqq", 0},
	{"xabcqq", "abcqq", 1},

	{0x3776c42000000000, 0x2cd8094a1a277627, "abc", "crc\x02s\xba\x84\x84\xbb\xcd]\xef4 \x00\x00\x00\x00\x00\x00", "crc\x02`&\x9aR\xe1\xb7\xfee3\x02\x84w.e+\x05"},
	{0x336776c420000000, 0x3c9d28596e5960ba, "abcd", "crc\x02s\xba\x84\x84\xbb\xcd]\xef6\xc4 \x00\x00\x00\x00\x00", "crc\x02`&\x9aR\xe1\xb7\xfee\xbces \x0e\x84\xb0F"},

		iHasLeadingPercent bool
		resultExpected     string
		matchExpected      bool
	}{
		{"abcd", "bcd", false, "", false},
		{"abcd", "bcd", true, "", true},
		{"abcd", "abcd", false, "", true},
		{"abcd", "abcd", true, "", true},
		{"abcd", "ab", false, "cd", true},
		{"abcd", "ab", true, "cd", true},
		{"abcd", "bc", false, "", false},
		{"abcd", "bc", true, "d", true},
	}

	for i, tc := range matcherCases {

        def step = new HasPrefixPatternStep(".abc", true)

        expect:
        step.matches(".abcd")
        step.matches(".abc")
        !step.matches(".")
        !step.matches(".a")
        !step.matches(".ab")
        !step.matches(".b")
        !step.matches(".bcd")
        !step.matches("_abc")
        !step.matches("")
        !step.matches("something else")
    }

		{"", "", 0},
		{"", "abc", 0},
		{"abc", "", -1},
		{"abc", "abc", 0},
		{"d", "abcdefg", 3},
		{"nan", "banana", 2},
		{"pan", "anpanman", 2},
		{"nnaaman", "anpanmanam", -1},
		{"abcd", "abc", -1},
		{"abcd", "bcd", -1},
		{"bcd", "abcd", 1},
		{"abc", "acca", -1},
		{"aa", "aaa", 0},
		{"baa", "aaaaa", -1},
		{"at that", "which finally halts.  at that point", 22},
	}

	for _, tc := range testCases {

	"\xB9", "%B9",
	"\xBA", "%BA",
	"\xBB", "%BB",
	"\xBC", "%BC",
	"\xBD", "%BD",
	"\xBE", "%BE",
	"\xBF", "%BF",
	"\xC0", "%C0",
	"\xC1", "%C1",
	"\xC2", "%C2",
	"\xC3", "%C3",
	"\xC4", "%C4",
	"\xC5", "%C5",
	"\xC6", "%C6",
	"\xC7", "%C7",
	"\xC8", "%C8",
	"\xC9", "%C9",
	"\xCA", "%CA",
	"\xCB", "%CB",
	"\xCC", "%CC",
	"\xCD", "%CD",
	"\xCE", "%CE",
	"\xCF", "%CF",

    assertEqualCharNodes(traverser.breadthFirst(charactersOf("")), "");
    assertEqualCharNodes(traverser.breadthFirst(charactersOf("bc")), "bcd");
    assertEqualCharNodes(traverser.breadthFirst(charactersOf("a")), "abcd");
    assertEqualCharNodes(traverser.breadthFirst(charactersOf("acdb")), "acdb");
    assertEqualCharNodes(traverser.breadthFirst(charactersOf("db")), "db");
  }

  @Test

    assertEqualCharNodes(traverser.breadthFirst(charactersOf("")), "");
    assertEqualCharNodes(traverser.breadthFirst(charactersOf("bc")), "bcd");
    assertEqualCharNodes(traverser.breadthFirst(charactersOf("a")), "abcd");
    assertEqualCharNodes(traverser.breadthFirst(charactersOf("acdb")), "acdb");
    assertEqualCharNodes(traverser.breadthFirst(charactersOf("db")), "db");
  }

  @Test

E	a([bc]+)(c*d)		abcd		(0,4)(1,3)(3,4)
E	a([bc]*)(c+d)		abcd		(0,4)(1,2)(2,4)
E	a[bcd]*dcdcde		adcdcde		(0,7)
E	(ab|a)b*c		abc		(0,3)(0,2)
E	((a)(b)c)(d)		abcd		(0,4)(0,3)(0,1)(1,2)(3,4)
BE	[A-Za-z_][A-Za-z0-9_]*	alpha		(0,5)
E	^a(bc+|b[eh])g|.h$	abh		(1,3)
E	(bc+d$|ef*g.|h?i(j|k))	effgz		(0,5)(0,5)
E	(bc+d$|ef*g.|h?i(j|k))	ij		(0,2)(0,2)(1,2)
E	(bc+d$|ef*g.|h?i(j|k))	reffgz		(1,6)(1,6)

	{"88d4266fd4e6338d13b845fcf289579d209c897823b9217da3e161936f031589", "abcd", "sha\x03j\t\xe6g\xbbg\xae\x85<n\xf3r\xa5O\xf5:Q\x0eR\u007f\x...