00000100  cb 3b 74                                          |.;t|
>>> Flow 2 (server to client)
00000000  16 03 03 00 5d 02 00 00  59 03 03 ed c3 6f 59 34  |....]...Y....oY4|
00000010  78 33 49 00 68 50 1f a5  aa 93 45 9a 87 34 c4 4e  |x3I.hP....E..4.N|
00000020  71 b0 ab 5e 43 f7 a1 5c  89 e8 2f 20 f7 42 d7 2a  |q..^C..\../ .B.*|
00000030  a5 fe 16 76 ac 6f cf 20  1d a6 bc d5 9d 27 9d 81  |...v.o. .....'..|

	{`(?i:ab*c|d?e)1`, `(?i:(?:AB*C|D?E)1)`},
	{`(?i:ab*cd?e)1`, `(?i:AB*CD?E1)`},
	{`(?i:ab)[123](?i:cd)`, `(?i:AB[1-3]CD)`},
	{`(?i:ab*c|d?e)`, `(?i:AB*C|D?E)`},
	{`[Aa][Bb]`, `(?i:AB)`},
	{`[Aa][Bb]*[Cc]`, `(?i:AB*C)`},
	{`A(?:[Bb][Cc]|[Dd])[Zz]`, `A(?i:(?:BC|D)Z)`},
	{`[Aa](?:[Bb][Cc]|[Dd])Z`, `(?i:A(?:BC|D))Z`},
}

func TestString(t *testing.T) {
	for _, tt := range stringTests {
		re, err := Parse(tt.re, Perl)

		testCase{NewReplacer("a", "1", "aa", "2", "aaa", "3"), "aaaa", "1111"},

		testCase{NewReplacer("aaa", "3", "aa", "2", "a", "1"), "aaaa", "31"},
	)

	// gen1 has multiple old strings of variable length. There is no
	// overall non-empty common prefix, but some pairwise common prefixes.
	gen1 := NewReplacer(
		"aaa", "3[aaa]",
		"aa", "2[aa]",
		"a", "1[a]",
		"i", "i",
		"longerst", "most long",

00000270  00 bc cf 9c 7d b7 40 20  01 5f aa d3 16 61 09 a2  |....}.@ ._...a..|
00000280  76 fd 13 c3 cc e1 0c 5c  ee b1 87 82 f1 6c 04 ed  |v......\.....l..|
00000290  73 bb b3 43 77 8d 0c 1c  f1 0f a1 d8 40 83 61 c9  |s..Cw.......@.a.|
000002a0  4c 72 2b 9d ae db 46 06  06 4d f4 c1 b3 3e c0 d1  |Lr+...F..M...>..|
000002b0  bd 42 d4 db fe 3d 13 60  84 5c 21 d3 3b e9 fa e7  |.B...=.`.\!.;...|

00000010  73 82 d1 cf 84 ad 06 e9  76 39 dc e4 c8 34 af 53  |s.......v9...4.S|
00000020  06 ed ed 68 56 5f 76 11  4e f6 ff 20 55 fd 29 c5  |...hV_v.N.. U.).|
00000030  aa 56 af bd 5d 67 74 4f  08 8a 52 a1 7e cd b9 ac  |.V..]gtO..R.~...|
00000040  31 a0 2f 45 25 1f b2 24  71 26 80 17 c0 09 00 00  |1./E%..$q&......|
00000050  11 ff 01 00 01 00 00 0b  00 04 03 00 01 02 00 17  |................|

000002f0  f1 a7 c4 43 57 97 7f 28  37 e7 15 62 9b 1c f5 90  |...CW..(7..b....|
00000300  0c 19 36 1a c1 48 48 e5  7d 56 93 3c 13 e3 cd 6a  |..6..HH.}V.<...j|
00000310  aa aa ba d5 24 95 c7 df  9c a9 76 6c 07 bf 09 2d  |....$.....vl...-|
00000320  4b 7b 55 94 37 ec d4 69  ce ab 0f 48 37 74 37 99  |K{U.7..i...H7t7.|
00000330  83 0d 60 8a 73 56 fb e2  9e 0c 39 0e 23 bf 68 b2  |..`.sV....9.#.h.|

00000160  9f 6c 61 3c c0 b0 41 d4  d9 2b 2b 24 23 77 5b 1c  |.la<..A..++$#w[.|
00000170  3b bd 75 5d ce 20 54 cf  a1 63 87 1d 1e 24 c4 f3  |;.u]. T..c...$..|
00000180  1d 1a 50 8b aa b6 14 43  ed 97 a7 75 62 f4 14 c8  |..P....C...ub...|
00000190  52 d7 02 03 01 00 01 a3  81 93 30 81 90 30 0e 06  |R.........0..0..|
000001a0  03 55 1d 0f 01 01 ff 04  04 03 02 05 a0 30 1d 06  |.U...........0..|

00000270  00 bc cf 9c 7d b7 40 20  01 5f aa d3 16 61 09 a2  |....}.@ ._...a..|
00000280  76 fd 13 c3 cc e1 0c 5c  ee b1 87 82 f1 6c 04 ed  |v......\.....l..|
00000290  73 bb b3 43 77 8d 0c 1c  f1 0f a1 d8 40 83 61 c9  |s..Cw.......@.a.|
000002a0  4c 72 2b 9d ae db 46 06  06 4d f4 c1 b3 3e c0 d1  |Lr+...F..M...>..|
000002b0  bd 42 d4 db fe 3d 13 60  84 5c 21 d3 3b e9 fa e7  |.B...=.`.\!.;...|

		t.Fatal(err)
	}

	aa := NewFile(uintptr(afd), a.Name())
	defer aa.Close()
	bb := NewFile(uintptr(bfd), b.Name())
	defer bb.Close()

	// This would fail on Linux in case the copy_file_range syscall was used because it doesn't
	// support destination files opened with O_APPEND, see
	// https://man7.org/linux/man-pages/man2/copy_file_range.2.html#ERRORS
	_, err = io.Copy(aa, bb)
	if err != nil {
		t.Fatal(err)

		inferTypesForCmp(&a, &b)

		if a.Equals(b) {
			return true
		}

		// If elements, compare each.
		aA, aOK := a.ToArray()
		bA, bOK := b.ToArray()
		if aOK && bOK {
			if len(aA) != len(bA) {
				return false
			}
			for i := range aA {
				if !cmp(aA[i], bA[i]) {
					return false
				}
			}
			return true
		}
		// Try as numbers
		aF, aOK := a.ToFloat()