// Tests that currently fail when run against fancy-regex, see README.md.
//
// x2 tests check if a pattern matches against an input at the specified start/end positions.
// x3 tests have an additional argument which is the group number to check.


  // No match found
  x2("^a", "\na", 1, 2);

  // Compile failed: InvalidEscape
  x2("$\\O", "bb\n", 2, 3);

  // Compile failed: InvalidEscape
  x2("\\G", "", 0, 0);

  // Compile failed: InvalidEscape
  x2("\\Z", "", 0, 0);

  // Compile failed: InvalidEscape
  x2("\\ca", "\001", 0, 1);

  // Compile failed: InvalidEscape
  x2("\\C-b", "\002", 0, 1);

  // Compile failed: InvalidEscape
  x2("\\c\\\\", "\034", 0, 1);

  // Compile failed: InvalidEscape
  x2("q[\\c\\\\]", "q\034", 0, 2);

  // Compile failed: InvalidBackref
  x2("\\17", "\017", 0, 1);

  // Compile failed: UnknownFlag
  x2("a(?#....\\\\JJJJ)b", "ab", 0, 2);

  // No match found
  x2("(?x)  G (o O(?-x)oO) g L", "GoOoOgLe", 0, 7);

  // Compile failed: InvalidBackref
  x2("[\\044-\\047]", "\046", 0, 1);

  // Compile failed: InnerError(Syntax(
  // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  // regex parse error:
  //     [a-&&-a]
  //      ^^^
  // error: invalid character class range, the start must be <= the end
  // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  // ))
  x2("[a-&&-a]", "-", 0, 1);

  // Compile failed: InvalidEscape
  x2("\\A\\Z", "", 0, 0);

  // Compile failed: InvalidEscape
  x2("xyz\\Z", "xyz", 0, 3);

  // Compile failed: InvalidEscape
  x2("a\\Z", "a", 0, 1);

  // Compile failed: InvalidEscape
  x2("\\Gaz", "az", 0, 2);

  // No match found
  x2("(?i:ss)", "\xc3\x9f", 0, 2);

  // No match found
  x2("(?i:ss)", "\xe1\xba\x9e", 0, 3);

  // No match found
  x2("(?i:xssy)", "x\xc3\x9fy", 0, 4);

  // No match found
  x2("(?i:xssy)", "x\xe1\xba\x9ey", 0, 5);

  // No match found
  x2("(?i:\xc3\x9f)", "ss", 0, 2);

  // No match found
  x2("(?i:\xc3\x9f)", "SS", 0, 2);

  // No match found
  x2("(?i:[\xc3\x9f])", "ss", 0, 2);

  // No match found
  x2("(?i:[\xc3\x9f])", "SS", 0, 2);

  // No match found
  x2("(?m:.)", "\n", 0, 1);

  // No match found
  x2("(?m:a.)", "a\n", 0, 2);

  // No match found
  x2("(?m:.b)", "a\nb", 1, 3);

  // Match found at start 0 and end 1 (expected 0 and 0)
  x2("|a", "a", 0, 0);

  // Match found at start 0 and end 1 (expected 0 and 0)
  x2("(|a)", "a", 0, 0);

  // Compile failed: InvalidEscape
  x2("a|\\Gz", "bza", 2, 3);

  // Compile failed: InvalidEscape
  x2("a|\\Gz", "za", 0, 1);

  // Compile failed: InvalidEscape
  x2("a|b\\Z", "ba", 1, 2);

  // Compile failed: InvalidEscape
  x2("a|b\\Z", "b", 0, 1);

  // Match found at start 1 and end 2 (expected 0 and 2)
  x2("a(?i)b|c", "aC", 0, 2);

  // No match found
  x2("(?:ab)?{2}", "", 0, 0);

  // No match found
  x2("(?:ab)?{2}", "ababa", 0, 4);

  // No match found
  x2("(?:ab)*{0}", "ababa", 0, 0);

  // Match found at start 0 and end 2 (expected 0 and 5)
  x2("(?:ab){,}", "ab{,}", 0, 5);

  // No match found
  x2("(?:abc)+?{2}", "abcabcabc", 0, 6);

  // No match found
  x2("(abc)(?i:\\1)", "abcABC", 0, 6);

  // No match found
  x3("((?m:a.c))", "a\nc", 0, 3, 1);

  // Compile failed: InvalidBackref
  x2("(?:(?:\\1|z)(a))+$", "zaaa", 0, 4);

  // Compile failed: InvalidEscape
  x2("(a*\\Z)\\1", "a", 1, 1);

  // Compile failed: InvalidEscape
  x2(".(a*\\Z)\\1", "ba", 1, 2);

  // Compile failed: InvalidEscape
  x2("(a)\\g<1>", "aa", 0, 2);

  // Compile failed: UnknownFlag
  x2("(?<name1>a)", "a", 0, 1);

  // Compile failed: UnknownFlag
  x2("(?<name_2>ab)\\g<name_2>", "abab", 0, 4);

  // Compile failed: UnknownFlag
  x2("(?<name_3>.zv.)\\k<name_3>", "azvbazvb", 0, 8);

  // Compile failed: InvalidEscape
  x2("(?<=\\g<ab>)|-\\zEND (?<ab>XyZ)", "XyZ", 3, 3);

  // Compile failed: UnknownFlag
  x2("(?<n>|a\\g<n>)+", "", 0, 0);

  // Compile failed: UnknownFlag
  x2("(?<n>|\\(\\g<n>\\))+$", "()(())", 0, 6);

  // Compile failed: InvalidEscape
  x3("\\g<n>(?<n>.){0}", "X", 0, 1, 1);

  // Compile failed: InvalidEscape
  x2("\\g<n>(abc|df(?<n>.YZ){2,8}){0}", "XYZ", 0, 3);

  // Compile failed: UnknownFlag
  x2("\\A(?<n>(a\\g<n>)|)\\z", "aaaa", 0, 4);

  // Compile failed: UnknownFlag
  x2("(?<n>|\\g<m>\\g<n>)\\z|\\zEND (?<m>a|(b)\\g<m>)", "bbbbabba", 0, 8);

  // Compile failed: UnknownFlag
  x2("(?<name1240>\\w+\\sx)a+\\k<name1240>", "  fg xaaaaaaaafg x", 2, 18);

  // Compile failed: UnknownFlag
  x3("(z)()()(?<_9>a)\\g<_9>", "zaa", 2, 3, 1);

  // Compile failed: UnknownFlag
  x2("(.)(((?<_>a)))\\k<_>", "zaa", 0, 3);

  // Compile failed: UnknownFlag
  x2("((?<name1>\\d)|(?<name2>\\w))(\\k<name1>|\\k<name2>)", "ff", 0, 2);

  // Compile failed: UnknownFlag
  x2("(?:(?<x>)|(?<x>efg))\\k<x>", "", 0, 0);

  // Compile failed: UnknownFlag
  x2("(?:(?<x>abc)|(?<x>efg))\\k<x>", "abcefgefg", 3, 9);

  // Compile failed: UnknownFlag
  x2("(?:(?<n1>.)|(?<n1>..)|(?<n1>...)|(?<n1>....)|(?<n1>.....)|(?<n1>......)|(?<n1>.......)|(?<n1>........)|(?<n1>.........)|(?<n1>..........)|(?<n1>...........)|(?<n1>............)|(?<n1>.............)|(?<n1>..............))\\k<n1>$", "a-pyumpyum", 2, 10);

  // Compile failed: UnknownFlag
  x3("(?:(?<n1>.)|(?<n1>..)|(?<n1>...)|(?<n1>....)|(?<n1>.....)|(?<n1>......)|(?<n1>.......)|(?<n1>........)|(?<n1>.........)|(?<n1>..........)|(?<n1>...........)|(?<n1>............)|(?<n1>.............)|(?<n1>..............))\\k<n1>$", "xxxxabcdefghijklmnabcdefghijklmn", 4, 18, 14);

  // Compile failed: UnknownFlag
  x3("(?<name1>)(?<name2>)(?<name3>)(?<name4>)(?<name5>)(?<name6>)(?<name7>)(?<name8>)(?<name9>)(?<name10>)(?<name11>)(?<name12>)(?<name13>)(?<name14>)(?<name15>)(?<name16>aaa)(?<name17>)$", "aaa", 0, 3, 16);

  // Compile failed: UnknownFlag
  x2("(?<foo>a|\\(\\g<foo>\\))", "a", 0, 1);

  // Compile failed: UnknownFlag
  x2("(?<foo>a|\\(\\g<foo>\\))", "((((((a))))))", 0, 13);

  // Compile failed: UnknownFlag
  x3("(?<foo>a|\\(\\g<foo>\\))", "((((((((a))))))))", 0, 17, 1);

  // Compile failed: InvalidEscape
  x2("\\g<bar>|\\zEND(?<bar>.*abc$)", "abcxxxabc", 0, 9);

  // Compile failed: InvalidEscape
  x2("\\g<1>|\\zEND(.a.)", "bac", 0, 3);

  // Compile failed: InvalidEscape
  x3("\\g<_A>\\g<_A>|\\zEND(.a.)(?<_A>.b.)", "xbxyby", 3, 6, 1);

  // Compile failed: InvalidEscape
  x2("\\A(?:\\g<pon>|\\g<pan>|\\zEND  (?<pan>a|c\\g<pon>c)(?<pon>b|d\\g<pan>d))$", "cdcbcdc", 0, 7);

  // Compile failed: UnknownFlag
  x2("\\A(?<n>|a\\g<m>)\\z|\\zEND (?<m>\\g<n>)", "aaaa", 0, 4);

  // Compile failed: UnknownFlag
  x2("(?<n>(a|b\\g<n>c){3,5})", "baaaaca", 1, 5);

  // Compile failed: UnknownFlag
  x2("(?<n>(a|b\\g<n>c){3,5})", "baaaacaaaaa", 0, 10);

  // Compile failed: UnknownFlag
  x2("(?<pare>\\(([^\\(\\)]++|\\g<pare>)*+\\))", "((a))", 0, 5);

  // No match found
  x2("()*\\1", "", 0, 0);

  // No match found
  x2("(?:()|())*\\1\\2", "", 0, 0);

  // Compile failed: InvalidBackref
  x3("(?:\\1a|())*", "a", 0, 0, 1);

  // Compile failed: InvalidEscape
  x2("x((.)*)*x(?i:\\1)\\Z", "0x1x2x1X2", 1, 9);

  // No match found
  x2("(?:()|()|()|()|()|())*\\2\\5", "", 0, 0);

  // No match found
  x2("(?:()|()|()|(x)|()|())*\\2b\\5", "b", 0, 1);

  // Compile failed: InvalidEscape
  x3("(\\(((?:[^(]|\\g<1>)*)\\))", "(abc)(abc)", 1, 4, 2);

  // Compile failed: InvalidEscape
  x2("\\o{101}", "A", 0, 1);

  // Compile failed: InvalidEscape
  x2("\\A(a|b\\g<1>c)\\k<1+3>\\z", "bbacca", 0, 6);

  // Compile failed: InvalidEscape
  x2("(?i)\\A(a|b\\g<1>c)\\k<1+2>\\z", "bBACcbac", 0, 8);

  // Compile failed: UnknownFlag
  x2("(?i)(?<X>aa)|(?<X>bb)\\k<X>", "BBbb", 0, 4);

  // Compile failed: InvalidEscape
  x2("(?:\\k'+1'B|(A)C)*", "ACAB", 0, 4);

  // Compile failed: InvalidEscape
  x2("\\g<+2>(abc)(ABC){0}", "ABCabc", 0, 6);

  // Compile failed: InvalidEscape
  x2("A\\g'0'|B()", "AAAAB", 0, 5);

  // Compile failed: InvalidEscape
  x3("(A\\g'0')|B", "AAAAB", 0, 5, 1);

  // Compile failed: UnknownFlag
  x2("(a*)(?(1))aa", "aaaaa", 0, 5);

  // Compile failed: UnknownFlag
  x2("(a*)(?(-1))aa", "aaaaa", 0, 5);

  // Compile failed: UnknownFlag
  x2("(?<name>aaa)(?('name'))aa", "aaaaa", 0, 5);

  // Compile failed: UnknownFlag
  x2("(a)(?(1)aa|bb)a", "aaaaa", 0, 4);

  // Compile failed: UnknownFlag
  x2("(?:aa|())(?(<1>)aa|bb)a", "aabba", 0, 5);

  // Compile failed: UnknownFlag
  x2("(?:aa|())(?('1')aa|bb|cc)a", "aacca", 0, 5);

  // Compile failed: UnknownFlag
  x3("(a*)(?(1)aa|a)b", "aaab", 0, 1, 1);

  // Compile failed: UnknownFlag
  x2("(a)(?(1)|)c", "ac", 0, 2);

  // Compile failed: UnknownFlag
  x2("(a)(?(1+0)b|c)d", "abd", 0, 3);

  // Compile failed: UnknownFlag
  x2("(?:(?'name'a)|(?'name'b))(?('name')c|d)e", "ace", 0, 3);

  // Compile failed: UnknownFlag
  x2("(?:(?'name'a)|(?'name'b))(?('name')c|d)e", "bce", 0, 3);

  // Compile failed: InvalidEscape
  x2("\\R", "\r\n", 0, 2);

  // Compile failed: InvalidEscape
  x2("\\R", "\r", 0, 1);

  // Compile failed: InvalidEscape
  x2("\\R", "\n", 0, 1);

  // Compile failed: InvalidEscape
  x2("\\R", "\x0b", 0, 1);

  // Compile failed: InvalidEscape
  x2("\\R", "\xc2\x85", 0, 2);

  // Compile failed: InvalidEscape
  x2("\\N", "a", 0, 1);

  // Compile failed: InvalidEscape
  x2("\\O", "a", 0, 1);

  // Compile failed: InvalidEscape
  x2("\\O", "\n", 0, 1);

  // Compile failed: InvalidEscape
  x2("(?m:\\O)", "\n", 0, 1);

  // Compile failed: InvalidEscape
  x2("(?-m:\\O)", "\n", 0, 1);

  // Compile failed: InvalidEscape
  x2("\\K", "a", 0, 0);

  // Compile failed: InvalidEscape
  x2("a\\K", "a", 1, 1);

  // Compile failed: InvalidEscape
  x2("a\\Kb", "ab", 1, 2);

  // Compile failed: InvalidEscape
  x2("(a\\Kb|ac\\Kd)", "acd", 2, 3);

  // Compile failed: InvalidEscape
  x2("(a\\Kb|\\Kac\\K)*", "acababacab", 9, 10);

  // No match found
  x2("(?:()|())*\\1", "abc", 0, 0);

  // No match found
  x2("(?:()|())*\\2", "abc", 0, 0);

  // No match found
  x2("(?:()|()|())*\\3\\1", "abc", 0, 0);

  // Compile failed: InvalidEscape
  x2("(|(?:a(?:\\g'1')*))b|", "abc", 0, 2);

  // Compile failed: UnknownFlag
  x2("((?<x>abc){0}a\\g<x>d)+", "aabcd", 0, 5);

  // Compile failed: UnknownFlag
  x2("((?(abc)true|false))+", "false", 0, 5);

  // Compile failed: UnknownFlag
  x2("()(?<x>ab)(?(<x>)a|b)", "aba", 0, 3);

  // Compile failed: UnknownFlag
  x2("(?<=(?(a)a|bb))z", "aaz", 2, 3);

  // Compile failed: UnknownFlag
  x2("(?<x>a)(?<x>b)(\\k<x>)+", "abbaab", 0, 6);

  // Compile failed: UnknownFlag
  x2("((?(a)b|c))(\\1)", "abab", 0, 4);

  // Compile failed: UnknownFlag
  x2("(?<x>$|b\\g<x>)", "bbb", 0, 3);

  // Compile failed: UnknownFlag
  x2("(?<x>(?(a)a|b)|c\\g<x>)", "cccb", 0, 4);

  // Compile failed: UnknownFlag
  x2("(a)(?(1)a*|b*)+", "aaaa", 0, 4);

  // Compile failed: InvalidEscape
  x2("[\\o{101}]", "A", 0, 1);

  // Compile failed: InvalidEscape
  x2("[\\u0041]", "A", 0, 1);

  // Compile failed: UnknownFlag
  x2("(?~)", "", 0, 0);

  // Compile failed: UnknownFlag
  x2("(?~)", "A", 0, 0);

  // Compile failed: UnknownFlag
  x2("aaaaa(?~)", "aaaaaaaaaa", 0, 5);

  // Compile failed: UnknownFlag
  x2("(?~(?:|aaa))", "aaa", 0, 0);

  // Compile failed: UnknownFlag
  x2("(?~aaa|)", "aaa", 0, 0);

  // Compile failed: UnknownFlag
  x2("a(?~(?~)).", "abcdefghijklmnopqrstuvwxyz", 0, 26);

  // Compile failed: UnknownFlag
  x2("/\\*(?~\\*/)\\*/", "/* */ */", 0, 5);

  // Compile failed: UnknownFlag
  x2("(?~\\w+)zzzzz", "zzzzz", 0, 5);

  // Compile failed: UnknownFlag
  x2("(?~\\w*)zzzzz", "zzzzz", 0, 5);

  // Compile failed: UnknownFlag
  x2("(?~A.C|B)", "ABC", 0, 0);

  // Compile failed: UnknownFlag
  x2("(?~XYZ|ABC)a", "ABCa", 1, 4);

  // Compile failed: UnknownFlag
  x2("(?~XYZ|ABC)a", "aABCa", 0, 1);

  // Compile failed: UnknownFlag
  x2("<[^>]*>(?~[<>])</[^>]*>", "<a>vvv</a>   <b>  </b>", 0, 10);

  // Compile failed: UnknownFlag
  x2("(?~ab)", "ccc\ndab", 0, 5);

  // Compile failed: UnknownFlag
  x2("(?m:(?~ab))", "ccc\ndab", 0, 5);

  // Compile failed: UnknownFlag
  x2("(?-m:(?~ab))", "ccc\ndab", 0, 5);

  // Compile failed: UnknownFlag
  x2("(?~abc)xyz", "xyz012345678901234567890123456789abc", 0, 3);

  // Compile failed: UnknownFlag
  x2("(?~|78|\\d*)", "123456789", 0, 6);

  // Compile failed: UnknownFlag
  x2("(?~|def|(?:abc|de|f){0,100})", "abcdedeabcfdefabc", 0, 11);

  // Compile failed: UnknownFlag
  x2("(?~|ab|.*)", "ccc\nddd", 0, 3);

  // Compile failed: UnknownFlag
  x2("(?~|ab|\\O*)", "ccc\ndab", 0, 5);

  // Compile failed: UnknownFlag
  x2("(?~|ab|\\O{2,10})", "ccc\ndab", 0, 5);

  // Compile failed: UnknownFlag
  x2("(?~|ab|\\O{1,10})", "ab", 1, 2);

  // Compile failed: UnknownFlag
  x2("(?~|abc|\\O{1,10})", "abc", 1, 3);

  // Compile failed: UnknownFlag
  x2("(?~|ab|\\O{5,10})|abc", "abc", 0, 3);

  // Compile failed: UnknownFlag
  x2("(?~|ab|\\O{1,10})", "cccccccccccab", 0, 10);

  // Compile failed: UnknownFlag
  x2("(?~|aaa|)", "aaa", 0, 0);

  // Compile failed: UnknownFlag
  x2("(?~||a*)", "aaaaaa", 0, 0);

  // Compile failed: UnknownFlag
  x2("(?~||a*?)", "aaaaaa", 0, 0);

  // Compile failed: UnknownFlag
  x2("(a)(?~|b|\\1)", "aaaaaa", 0, 2);

  // Compile failed: UnknownFlag
  x2("(a)(?~|bb|(?:a\\1)*)", "aaaaaa", 0, 5);

  // Compile failed: UnknownFlag
  x2("(b|c)(?~|abac|(?:a\\1)*)", "abababacabab", 1, 4);

  // Compile failed: UnknownFlag
  x2("(?~|aaaaa|a*+)", "aaaaa", 0, 0);

  // Compile failed: UnknownFlag
  x2("(?~|aaaaaa|a*+)b", "aaaaaab", 1, 7);

  // Compile failed: UnknownFlag
  x2("(?~|abcd|(?>))", "zzzabcd", 0, 0);

  // Compile failed: UnknownFlag
  x2("(?~|abc|a*?)", "aaaabc", 0, 0);

  // Compile failed: UnknownFlag
  x2("(?~|abc)a*", "aaaaaabc", 0, 5);

  // Compile failed: UnknownFlag
  x2("(?~|abc)a*z|aaaaaabc", "aaaaaabc", 0, 8);

  // Compile failed: UnknownFlag
  x2("(?~|aaaaaa)a*", "aaaaaa", 0, 0);

  // Compile failed: UnknownFlag
  x2("(?~|abc)aaaa|aaaabc", "aaaabc", 0, 6);

  // Compile failed: UnknownFlag
  x2("(?>(?~|abc))aaaa|aaaabc", "aaaabc", 0, 6);

  // Compile failed: UnknownFlag
  x2("(?~|)a", "a", 0, 1);

  // Compile failed: UnknownFlag
  x2("(?~|a)(?~|)a", "a", 0, 1);

  // Compile failed: UnknownFlag
  x2("(?~|a).*(?~|)a", "bbbbbbbbbbbbbbbbbbbba", 0, 21);

  // Compile failed: UnknownFlag
  x2("(?~|abc).*(xyz|pqr)(?~|)abc", "aaaaxyzaaapqrabc", 0, 16);

  // Compile failed: UnknownFlag
  x2("(?~|abc).*(xyz|pqr)(?~|)abc", "aaaaxyzaaaabcpqrabc", 11, 19);

  // No match found
  x2("\\xca\\xb8", "\xca\xb8", 0, 2);

  // Compile failed: InvalidEscape
  x2("むめも\\Z", "むめも", 0, 9);

  // Compile failed: InvalidEscape
  x2("かきく\\Z", "かきく\n", 0, 9);

  // Compile failed: InvalidEscape
  x2("\\Gぽぴ", "ぽぴ", 0, 6);

  // No match found
  x2("(?m:よ.)", "よ\n", 0, 4);

  // No match found
  x2("(?m:.め)", "ま\nめ", 3, 7);

  // Compile failed: InvalidEscape
  x2("鬼|\\G車", "け車鬼", 6, 9);

  // Compile failed: InvalidEscape
  x2("鬼|\\G車", "車鬼", 0, 3);

  // Compile failed: InvalidEscape
  x2("鬼|車\\Z", "車鬼", 3, 6);

  // Compile failed: InvalidEscape
  x2("鬼|車\\Z", "車", 0, 3);

  // Compile failed: InvalidEscape
  x2("鬼|車\\Z", "車\n", 0, 3);

  // No match found
  x2("(?:あい)?{2}", "", 0, 0);

  // No match found
  x2("(?:鬼車)?{2}", "鬼車鬼車鬼", 0, 12);

  // No match found
  x2("(?:鬼車)*{0}", "鬼車鬼車鬼", 0, 0);

  // Match found at start 0 and end 6 (expected 0 and 9)
  x2("(?:鬼車){,}", "鬼車{,}", 0, 9);

  // No match found
  x2("(?:かきく)+?{2}", "かきくかきくかきく", 0, 18);

  // No match found
  x3("()(あ)いう(えおか)きくけこ", "あいうえおかきくけこ", 9, 18, 3);

  // No match found
  x3("(()(あ)いう(えおか)きくけこ)", "あいうえおかきくけこ", 9, 18, 4);

  // No match found
  x3(".*(フォ)ン・マ(ン()シュタ)イン", "フォン・マンシュタイン", 15, 27, 2);

  // No match found
  x3("((?m:あ.う))", "あ\nう", 0, 7, 1);

  // Compile failed: InvalidEscape
  x2("(あ*\\Z)\\1", "あ", 3, 3);

  // Compile failed: InvalidEscape
  x2(".(あ*\\Z)\\1", "いあ", 3, 6);

  // Compile failed: UnknownFlag
  x2("(?<愚か>変|\\(\\g<愚か>\\))", "((((((変))))))", 0, 15);

  // Compile failed: InvalidEscape
  x2("\\A(?:\\g<阿_1>|\\g<云_2>|\\z終了  (?<阿_1>観|自\\g<云_2>自)(?<云_2>在|菩薩\\g<阿_1>菩薩))$", "菩薩自菩薩自在自菩薩自菩薩", 0, 39);

  // Compile failed: InnerError(Syntax(
  // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  // regex parse error:
  //     [あ-&&-あ]
  //      ^^^
  // error: invalid character class range, the start must be <= the end
  // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  // ))
  x2("[あ-&&-あ]", "-", 0, 1);

  // Compile failed: InnerError(Syntax(
  // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  // regex parse error:
  //     \p{^Emoji}
  //     ^^^^^^^^^^
  // error: Unicode property not found
  // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  // ))
  x2("\\p{^Emoji}", "\xEF\xBC\x93", 0, 3);

  // Compile failed: InnerError(Syntax(
  // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  // regex parse error:
  //     \p{Word}
  //     ^^^^^^^^
  // error: Unicode property not found
  // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  // ))
  x2("\\p{Word}", "こ", 0, 3);

  // Compile failed: InnerError(Syntax(
  // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  // regex parse error:
  //     [\p{Word}]
  //      ^^^^^^^^
  // error: Unicode property not found
  // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  // ))
  x2("[\\p{Word}]", "こ", 0, 3);

  // Compile failed: InnerError(Syntax(
  // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  // regex parse error:
  //     [^\p{^Word}]
  //       ^^^^^^^^^
  // error: Unicode property not found
  // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  // ))
  x2("[^\\p{^Word}]", "こ", 0, 3);

  // Compile failed: InnerError(Syntax(
  // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  // regex parse error:
  //     [^\p{^Word}&&\p{ASCII}]
  //       ^^^^^^^^^
  // error: Unicode property not found
  // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  // ))
  x2("[^\\p{^Word}&&\\p{ASCII}]", "こ", 0, 3);

  // Compile failed: InnerError(Syntax(
  // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  // regex parse error:
  //     [^\p{^Word}&&\p{ASCII}]
  //       ^^^^^^^^^
  // error: Unicode property not found
  // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  // ))
  x2("[^\\p{^Word}&&\\p{ASCII}]", "a", 0, 1);

  // Compile failed: InnerError(Syntax(
  // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  // regex parse error:
  //     [^[\p{^Word}]&&[\p{ASCII}]]
  //        ^^^^^^^^^
  // error: Unicode property not found
  // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  // ))
  x2("[^[\\p{^Word}]&&[\\p{ASCII}]]", "こ", 0, 3);

  // Compile failed: InnerError(Syntax(
  // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  // regex parse error:
  //     [^[\p{ASCII}]&&[^\p{Word}]]
  //                      ^^^^^^^^
  // error: Unicode property not found
  // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  // ))
  x2("[^[\\p{ASCII}]&&[^\\p{Word}]]", "こ", 0, 3);

  // Compile failed: InnerError(Syntax(
  // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  // regex parse error:
  //     [^[\p{^Word}]&&[^\p{ASCII}]]
  //        ^^^^^^^^^
  // error: Unicode property not found
  // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  // ))
  x2("[^[\\p{^Word}]&&[^\\p{ASCII}]]", "こ", 0, 3);

  // Compile failed: InnerError(Syntax(
  // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  // regex parse error:
  //     [^\p{^Word}&&[^၊]]
  //       ^^^^^^^^^
  // error: Unicode property not found
  // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  // ))
  x2("[^\\p{^Word}&&[^\\x{104a}]]", "こ", 0, 3);

  // Compile failed: InnerError(Syntax(
  // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  // regex parse error:
  //     [^[\p{^Word}]&&[^၊]]
  //        ^^^^^^^^^
  // error: Unicode property not found
  // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  // ))
  x2("[^[\\p{^Word}]&&[^\\x{104a}]]", "こ", 0, 3);

  // Compile failed: InnerError(Syntax(
  // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  // regex parse error:
  //     \p{^Cntrl}
  //     ^^^^^^^^^^
  // error: Unicode property not found
  // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  // ))
  x2("\\p{^Cntrl}", "こ", 0, 3);

  // Compile failed: InnerError(Syntax(
  // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  // regex parse error:
  //     [\p{^Cntrl}]
  //      ^^^^^^^^^^
  // error: Unicode property not found
  // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  // ))
  x2("[\\p{^Cntrl}]", "こ", 0, 3);

  // Compile failed: InnerError(Syntax(
  // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  // regex parse error:
  //     [^[\p{^Cntrl}]&&[\p{ASCII}]]
  //        ^^^^^^^^^^
  // error: Unicode property not found
  // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  // ))
  x2("[^[\\p{^Cntrl}]&&[\\p{ASCII}]]", "こ", 0, 3);

  // Compile failed: UnknownFlag
  x2("(?-W:\\p{Word})", "こ", 0, 3);

  // Compile failed: UnknownFlag
  x2("(?W:\\p{Word})", "k", 0, 1);

  // Compile failed: UnknownFlag
  x2("(?-W:[[:word:]])", "こ", 0, 3);

  // Compile failed: UnknownFlag
  x2("(?-D:\\p{Digit})", "３", 0, 3);

  // Compile failed: UnknownFlag
  x2("(?-S:\\p{Space})", "\xc2\x85", 0, 2);

  // Compile failed: UnknownFlag
  x2("(?-P:\\p{Word})", "こ", 0, 3);

  // Compile failed: UnknownFlag
  x2("(?-W:\\w)", "こ", 0, 3);

  // Compile failed: UnknownFlag
  x2("(?-W:\\w)", "k", 0, 1);

  // Compile failed: UnknownFlag
  x2("(?W:\\w)", "k", 0, 1);

  // Compile failed: UnknownFlag
  x2("(?W:\\W)", "こ", 0, 3);

  // Compile failed: UnknownFlag
  x2("(?-W:\\b)", "こ", 0, 0);

  // Compile failed: UnknownFlag
  x2("(?-W:\\b)", "h", 0, 0);

  // Compile failed: UnknownFlag
  x2("(?W:\\b)", "h", 0, 0);

  // Compile failed: UnknownFlag
  x2("(?W:\\B)", "こ", 0, 0);

  // Compile failed: UnknownFlag
  x2("(?-P:\\b)", "こ", 0, 0);

  // Compile failed: UnknownFlag
  x2("(?-P:\\b)", "h", 0, 0);

  // Compile failed: UnknownFlag
  x2("(?P:\\b)", "h", 0, 0);

  // Compile failed: UnknownFlag
  x2("(?P:\\B)", "こ", 0, 0);

  // Compile failed: InnerError(Syntax(
  // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  // regex parse error:
  //     \p{InBasicLatin}
  //     ^^^^^^^^^^^^^^^^
  // error: Unicode property not found
  // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  // ))
  x2("\\p{InBasicLatin}", "\x41", 0, 1);

  // Compile failed: InvalidEscape
  x2(".\\Y\\O", "\x0d\x0a", 0, 2);

  // Compile failed: InvalidEscape
  x2(".\\Y.", "\x67\xCC\x88", 0, 3);

  // Compile failed: InvalidEscape
  x2("\\y.\\Y.\\y", "\x67\xCC\x88", 0, 3);

  // Compile failed: InvalidEscape
  x2("\\y.\\y", "\xEA\xB0\x81", 0, 3);

  // Compile failed: InvalidEscape
  x2("^.\\Y.\\Y.$", "\xE1\x84\x80\xE1\x85\xA1\xE1\x86\xA8", 0, 9);

  // Compile failed: InvalidEscape
  x2(".\\Y.", "\xE0\xAE\xA8\xE0\xAE\xBF", 0, 6);

  // Compile failed: InvalidEscape
  x2(".\\Y.", "\xE0\xB8\x81\xE0\xB8\xB3", 0, 6);

  // Compile failed: InvalidEscape
  x2(".\\Y.", "\xE0\xA4\xB7\xE0\xA4\xBF", 0, 6);

  // Compile failed: InvalidEscape
  x2("..\\Y.", "\xE3\x80\xB0\xE2\x80\x8D\xE2\xAD\x95", 0, 9);

  // Compile failed: InvalidEscape
  x2("...\\Y.", "\xE3\x80\xB0\xCC\x82\xE2\x80\x8D\xE2\xAD\x95", 0, 11);

  // Compile failed: InvalidEscape
  x2("^\\X$", "\x0d\x0a", 0, 2);

  // Compile failed: InvalidEscape
  x2("^\\X$", "\x67\xCC\x88", 0, 3);

  // Compile failed: InvalidEscape
  x2("^\\X$", "\xE1\x84\x80\xE1\x85\xA1\xE1\x86\xA8", 0, 9);

  // Compile failed: InvalidEscape
  x2("^\\X$", "\xE0\xAE\xA8\xE0\xAE\xBF", 0, 6);

  // Compile failed: InvalidEscape
  x2("^\\X$", "\xE0\xB8\x81\xE0\xB8\xB3", 0, 6);

  // Compile failed: InvalidEscape
  x2("^\\X$", "\xE0\xA4\xB7\xE0\xA4\xBF", 0, 6);

  // Compile failed: InvalidEscape
  x2("h\\Xllo", "ha\xCC\x80llo", 0, 7);

  // Compile failed: UnknownFlag
  x2("(?y{g})\\yabc\\y", "abc", 0, 3);

  // Compile failed: UnknownFlag
  x2("(?y{g})\\y\\X\\y", "abc", 0, 1);

  // Compile failed: UnknownFlag
  x2("(?y{w})\\yabc\\y", "abc", 0, 3);

  // Compile failed: UnknownFlag
  x2("(?y{w})\\X", "\r\n", 0, 2);

  // Compile failed: UnknownFlag
  x2("(?y{w})\\X", "\x0cz", 0, 1);

  // Compile failed: UnknownFlag
  x2("(?y{w})\\X", "q\x0c", 0, 1);

  // Compile failed: UnknownFlag
  x2("(?y{w})\\X", "\xE2\x80\x8D\xE2\x9D\x87", 0, 6);

  // Compile failed: UnknownFlag
  x2("(?y{w})\\X", "\x20\x20", 0, 2);

  // Compile failed: UnknownFlag
  x2("(?y{w})\\X", "a\xE2\x80\x8D", 0, 4);

  // Compile failed: UnknownFlag
  x2("(?y{w})\\y\\X\\y", "abc", 0, 3);

  // Compile failed: UnknownFlag
  x2("(?y{w})\\y\\X\\y", "v\xCE\x87w", 0, 4);

  // Compile failed: UnknownFlag
  x2("(?y{w})\\y\\X\\y", "\xD7\x93\x27", 0, 3);

  // Compile failed: UnknownFlag
  x2("(?y{w})\\y\\X\\y", "\xD7\x93\x22\xD7\x93", 0, 5);

  // Compile failed: UnknownFlag
  x2("(?y{w})\\X", "14 45", 0, 2);

  // Compile failed: UnknownFlag
  x2("(?y{w})\\X", "a14", 0, 3);

  // Compile failed: UnknownFlag
  x2("(?y{w})\\X", "832e", 0, 4);

  // Compile failed: UnknownFlag
  x2("(?y{w})\\X", "8\xEF\xBC\x8C\xDB\xB0", 0, 6);

  // Compile failed: UnknownFlag
  x2("(?y{w})\\y\\X\\y", "ケン", 0, 6);

  // Compile failed: UnknownFlag
  x2("(?y{w})\\y\\X\\y", "ケン\xE2\x80\xAFタ", 0, 12);

  // Compile failed: UnknownFlag
  x2("(?y{w})\\y\\X\\y", "\x21\x23", 0, 1);

  // Compile failed: UnknownFlag
  x2("(?y{w})\\y\\X\\y", "山ア", 0, 3);

  // Compile failed: UnknownFlag
  x2("(?y{w})\\X", "3.14", 0, 4);

  // Compile failed: UnknownFlag
  x2("(?y{w})\\X", "3 14", 0, 1);

  // Compile failed: InvalidHex
  x2("\\x1", "\x01", 0, 1);

  // Compile failed: InvalidEscape
  x2("\\u4E38", "\xE4\xB8\xB8", 0, 3);

  // Compile failed: InvalidEscape
  x2("\\u0040", "@", 0, 1);

  // Compile failed: UnknownFlag
  x2("((?()0+)+++(((0\\g<0>)0)|())++++((?(1)(0\\g<0>))++++++0*())++++((?(1)(0\\g<1>)+)++++++++++*())++++((?(1)((0)\\g<0>)+)++())+0++*+++(((0\\g<0>))*())++++((?(1)(0\\g<0>)+)++++++++++*|)++++*+++((?(1)((0)\\g<0>)+)+++++++++())++*|)++++((?()0))|", "abcde", 0, 0);

  // Compile failed: InnerError(Syntax(
  // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  // regex parse error:
  //     (?:[ab]|(*MAX{2}).)*
  //              ^
  // error: repetition operator missing expression
  // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  // ))
  x2("(?:[ab]|(*MAX{2}).)*", "abcbaaccaaa", 0, 7);

  // Compile failed: InnerError(Syntax(
  // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  // regex parse error:
  //     (?:(*COUNT[AB]\{X\})[ab]|(*COUNT[CD]\{X\})[cd])*(*CMP\{AB,<,CD\})
  //         ^
  // error: repetition operator missing expression
  // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  // ))
  x2("(?:(*COUNT[AB]{X})[ab]|(*COUNT[CD]{X})[cd])*(*CMP{AB,<,CD})",
     "abababcdab", 5, 8);

  // Compile failed: UnknownFlag
  x2("(?(?{....})123|456)", "123", 0, 3);

  // Compile failed: UnknownFlag
  x2("(?(*FAIL)123|456)", "456", 0, 3);

  // Compile failed: InvalidEscape
  x2("\\g'0'++{,0}",   "abcdefgh", 0, 0);

  // Compile failed: InvalidEscape
  x2("\\g'0'++{,0}?",  "abcdefgh", 0, 0);

  // Compile failed: InvalidEscape
  x2("\\g'0'++{,0}b",  "abcdefgh", 1, 2);

  // Compile failed: InvalidEscape
  x2("\\g'0'++{,0}?def", "abcdefgh", 3, 6);

  // Compile failed: InnerError(Syntax(
  // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  // regex parse error:
  //     a{3,2}b
  //      ^^^^^
  // error: invalid repetition count range, the start must be <= the end
  // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  // ))
  x2("a{3,2}b", "aaab", 0, 4);

  // Compile failed: InnerError(Syntax(
  // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  // regex parse error:
  //     a{3,2}b
  //      ^^^^^
  // error: invalid repetition count range, the start must be <= the end
  // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  // ))
  x2("a{3,2}b", "aaaab", 1, 5);

  // Compile failed: InnerError(Syntax(
  // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  // regex parse error:
  //     a{3,2}b
  //      ^^^^^
  // error: invalid repetition count range, the start must be <= the end
  // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  // ))
  x2("a{3,2}b", "aab", 0, 3);

  // Compile failed: InnerError(Syntax(
  // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  // regex parse error:
  //     a{3,2}?
  //      ^^^^^^
  // error: invalid repetition count range, the start must be <= the end
  // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  // ))
  x2("a{3,2}?", "", 0, 0);

  // No match found
  x2("a{2,3}+a", "aaa", 0, 3);

  // Compile failed: InnerError(Syntax(
  // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  // regex parse error:
  //     \p{In_Enclosed_CJK_Letters_and_Months}
  //     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  // error: Unicode property not found
  // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  // ))
  x2("\\p{In_Enclosed_CJK_Letters_and_Months}", "\xe3\x8b\xbf", 0, 3);