libgo/go/regexp/all_test.go

   1 // Copyright 2009 The Go Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style
   3 // license that can be found in the LICENSE file.
   4
   5 package regexp
   6
   7 import (
   8         "reflect"
   9         "strings"
  10         "testing"
  11 )
  12
  13 var good_re = []string{
  14         ``,
  15         `.`,
  16         `^.$`,
  17         `a`,
  18         `a*`,
  19         `a+`,
  20         `a?`,
  21         `a|b`,
  22         `a*|b*`,
  23         `(a*|b)(c*|d)`,
  24         `[a-z]`,
  25         `[a-abc-c\-\]\[]`,
  26         `[a-z]+`,
  27         `[abc]`,
  28         `[^1234]`,
  29         `[^\n]`,
  30         `\!\\`,
  31 }
  32
  33 type stringError struct {
  34         re  string
  35         err string
  36 }
  37
  38 var bad_re = []stringError{
  39         {`*`, "missing argument to repetition operator: `*`"},
  40         {`+`, "missing argument to repetition operator: `+`"},
  41         {`?`, "missing argument to repetition operator: `?`"},
  42         {`(abc`, "missing closing ): `(abc`"},
  43         {`abc)`, "unexpected ): `abc)`"},
  44         {`x[a-z`, "missing closing ]: `[a-z`"},
  45         {`[z-a]`, "invalid character class range: `z-a`"},
  46         {`abc\`, "trailing backslash at end of expression"},
  47         {`a**`, "invalid nested repetition operator: `**`"},
  48         {`a*+`, "invalid nested repetition operator: `*+`"},
  49         {`\x`, "invalid escape sequence: `\\x`"},
  50 }
  51
  52 func compileTest(t *testing.T, expr string, error string) *Regexp {
  53         re, err := Compile(expr)
  54         if error == "" && err != nil {
  55                 t.Error("compiling `", expr, "`; unexpected error: ", err.Error())
  56         }
  57         if error != "" && err == nil {
  58                 t.Error("compiling `", expr, "`; missing error")
  59         } else if error != "" && !strings.Contains(err.Error(), error) {
  60                 t.Error("compiling `", expr, "`; wrong error: ", err.Error(), "; want ", error)
  61         }
  62         return re
  63 }
  64
  65 func TestGoodCompile(t *testing.T) {
  66         for i := 0; i < len(good_re); i++ {
  67                 compileTest(t, good_re[i], "")
  68         }
  69 }
  70
  71 func TestBadCompile(t *testing.T) {
  72         for i := 0; i < len(bad_re); i++ {
  73                 compileTest(t, bad_re[i].re, bad_re[i].err)
  74         }
  75 }
  76
  77 func matchTest(t *testing.T, test *FindTest) {
  78         re := compileTest(t, test.pat, "")
  79         if re == nil {
  80                 return
  81         }
  82         m := re.MatchString(test.text)
  83         if m != (len(test.matches) > 0) {
  84                 t.Errorf("MatchString failure on %s: %t should be %t", test, m, len(test.matches) > 0)
  85         }
  86         // now try bytes
  87         m = re.Match([]byte(test.text))
  88         if m != (len(test.matches) > 0) {
  89                 t.Errorf("Match failure on %s: %t should be %t", test, m, len(test.matches) > 0)
  90         }
  91 }
  92
  93 func TestMatch(t *testing.T) {
  94         for _, test := range findTests {
  95                 matchTest(t, &test)
  96         }
  97 }
  98
  99 func matchFunctionTest(t *testing.T, test *FindTest) {
 100         m, err := MatchString(test.pat, test.text)
 101         if err == nil {
 102                 return
 103         }
 104         if m != (len(test.matches) > 0) {
 105                 t.Errorf("Match failure on %s: %t should be %t", test, m, len(test.matches) > 0)
 106         }
 107 }
 108
 109 func TestMatchFunction(t *testing.T) {
 110         for _, test := range findTests {
 111                 matchFunctionTest(t, &test)
 112         }
 113 }
 114
 115 type ReplaceTest struct {
 116         pattern, replacement, input, output string
 117 }
 118
 119 var replaceTests = []ReplaceTest{
 120         // Test empty input and/or replacement, with pattern that matches the empty string.
 121         {"", "", "", ""},
 122         {"", "x", "", "x"},
 123         {"", "", "abc", "abc"},
 124         {"", "x", "abc", "xaxbxcx"},
 125
 126         // Test empty input and/or replacement, with pattern that does not match the empty string.
 127         {"b", "", "", ""},
 128         {"b", "x", "", ""},
 129         {"b", "", "abc", "ac"},
 130         {"b", "x", "abc", "axc"},
 131         {"y", "", "", ""},
 132         {"y", "x", "", ""},
 133         {"y", "", "abc", "abc"},
 134         {"y", "x", "abc", "abc"},
 135
 136         // Multibyte characters -- verify that we don't try to match in the middle
 137         // of a character.
 138         {"[a-c]*", "x", "\u65e5", "x\u65e5x"},
 139         {"[^\u65e5]", "x", "abc\u65e5def", "xxx\u65e5xxx"},
 140
 141         // Start and end of a string.
 142         {"^[a-c]*", "x", "abcdabc", "xdabc"},
 143         {"[a-c]*$", "x", "abcdabc", "abcdx"},
 144         {"^[a-c]*$", "x", "abcdabc", "abcdabc"},
 145         {"^[a-c]*", "x", "abc", "x"},
 146         {"[a-c]*$", "x", "abc", "x"},
 147         {"^[a-c]*$", "x", "abc", "x"},
 148         {"^[a-c]*", "x", "dabce", "xdabce"},
 149         {"[a-c]*$", "x", "dabce", "dabcex"},
 150         {"^[a-c]*$", "x", "dabce", "dabce"},
 151         {"^[a-c]*", "x", "", "x"},
 152         {"[a-c]*$", "x", "", "x"},
 153         {"^[a-c]*$", "x", "", "x"},
 154
 155         {"^[a-c]+", "x", "abcdabc", "xdabc"},
 156         {"[a-c]+$", "x", "abcdabc", "abcdx"},
 157         {"^[a-c]+$", "x", "abcdabc", "abcdabc"},
 158         {"^[a-c]+", "x", "abc", "x"},
 159         {"[a-c]+$", "x", "abc", "x"},
 160         {"^[a-c]+$", "x", "abc", "x"},
 161         {"^[a-c]+", "x", "dabce", "dabce"},
 162         {"[a-c]+$", "x", "dabce", "dabce"},
 163         {"^[a-c]+$", "x", "dabce", "dabce"},
 164         {"^[a-c]+", "x", "", ""},
 165         {"[a-c]+$", "x", "", ""},
 166         {"^[a-c]+$", "x", "", ""},
 167
 168         // Other cases.
 169         {"abc", "def", "abcdefg", "defdefg"},
 170         {"bc", "BC", "abcbcdcdedef", "aBCBCdcdedef"},
 171         {"abc", "", "abcdabc", "d"},
 172         {"x", "xXx", "xxxXxxx", "xXxxXxxXxXxXxxXxxXx"},
 173         {"abc", "d", "", ""},
 174         {"abc", "d", "abc", "d"},
 175         {".+", "x", "abc", "x"},
 176         {"[a-c]*", "x", "def", "xdxexfx"},
 177         {"[a-c]+", "x", "abcbcdcdedef", "xdxdedef"},
 178         {"[a-c]*", "x", "abcbcdcdedef", "xdxdxexdxexfx"},
 179
 180         // Substitutions
 181         {"a+", "($0)", "banana", "b(a)n(a)n(a)"},
 182         {"a+", "(${0})", "banana", "b(a)n(a)n(a)"},
 183         {"a+", "(${0})$0", "banana", "b(a)an(a)an(a)a"},
 184         {"a+", "(${0})$0", "banana", "b(a)an(a)an(a)a"},
 185         {"hello, (.+)", "goodbye, ${1}", "hello, world", "goodbye, world"},
 186         {"hello, (.+)", "goodbye, $1x", "hello, world", "goodbye, "},
 187         {"hello, (.+)", "goodbye, ${1}x", "hello, world", "goodbye, worldx"},
 188         {"hello, (.+)", "<$0><$1><$2><$3>", "hello, world", "<hello, world><world><><>"},
 189         {"hello, (?P<noun>.+)", "goodbye, $noun!", "hello, world", "goodbye, world!"},
 190         {"hello, (?P<noun>.+)", "goodbye, ${noun}", "hello, world", "goodbye, world"},
 191         {"(?P<x>hi)|(?P<x>bye)", "$x$x$x", "hi", "hihihi"},
 192         {"(?P<x>hi)|(?P<x>bye)", "$x$x$x", "bye", "byebyebye"},
 193         {"(?P<x>hi)|(?P<x>bye)", "$xyz", "hi", ""},
 194         {"(?P<x>hi)|(?P<x>bye)", "${x}yz", "hi", "hiyz"},
 195         {"(?P<x>hi)|(?P<x>bye)", "hello $$x", "hi", "hello $x"},
 196         {"a+", "${oops", "aaa", "${oops"},
 197         {"a+", "$$", "aaa", "$"},
 198         {"a+", "$", "aaa", "$"},
 199
 200         // Substitution when subexpression isn't found
 201         {"(x)?", "$1", "123", "123"},
 202         {"abc", "$1", "123", "123"},
 203 }
 204
 205 var replaceLiteralTests = []ReplaceTest{
 206         // Substitutions
 207         {"a+", "($0)", "banana", "b($0)n($0)n($0)"},
 208         {"a+", "(${0})", "banana", "b(${0})n(${0})n(${0})"},
 209         {"a+", "(${0})$0", "banana", "b(${0})$0n(${0})$0n(${0})$0"},
 210         {"a+", "(${0})$0", "banana", "b(${0})$0n(${0})$0n(${0})$0"},
 211         {"hello, (.+)", "goodbye, ${1}", "hello, world", "goodbye, ${1}"},
 212         {"hello, (?P<noun>.+)", "goodbye, $noun!", "hello, world", "goodbye, $noun!"},
 213         {"hello, (?P<noun>.+)", "goodbye, ${noun}", "hello, world", "goodbye, ${noun}"},
 214         {"(?P<x>hi)|(?P<x>bye)", "$x$x$x", "hi", "$x$x$x"},
 215         {"(?P<x>hi)|(?P<x>bye)", "$x$x$x", "bye", "$x$x$x"},
 216         {"(?P<x>hi)|(?P<x>bye)", "$xyz", "hi", "$xyz"},
 217         {"(?P<x>hi)|(?P<x>bye)", "${x}yz", "hi", "${x}yz"},
 218         {"(?P<x>hi)|(?P<x>bye)", "hello $$x", "hi", "hello $$x"},
 219         {"a+", "${oops", "aaa", "${oops"},
 220         {"a+", "$$", "aaa", "$$"},
 221         {"a+", "$", "aaa", "$"},
 222 }
 223
 224 type ReplaceFuncTest struct {
 225         pattern       string
 226         replacement   func(string) string
 227         input, output string
 228 }
 229
 230 var replaceFuncTests = []ReplaceFuncTest{
 231         {"[a-c]", func(s string) string { return "x" + s + "y" }, "defabcdef", "defxayxbyxcydef"},
 232         {"[a-c]+", func(s string) string { return "x" + s + "y" }, "defabcdef", "defxabcydef"},
 233         {"[a-c]*", func(s string) string { return "x" + s + "y" }, "defabcdef", "xydxyexyfxabcydxyexyfxy"},
 234 }
 235
 236 func TestReplaceAll(t *testing.T) {
 237         for _, tc := range replaceTests {
 238                 re, err := Compile(tc.pattern)
 239                 if err != nil {
 240                         t.Errorf("Unexpected error compiling %q: %v", tc.pattern, err)
 241                         continue
 242                 }
 243                 actual := re.ReplaceAllString(tc.input, tc.replacement)
 244                 if actual != tc.output {
 245                         t.Errorf("%q.ReplaceAllString(%q,%q) = %q; want %q",
 246                                 tc.pattern, tc.input, tc.replacement, actual, tc.output)
 247                 }
 248                 // now try bytes
 249                 actual = string(re.ReplaceAll([]byte(tc.input), []byte(tc.replacement)))
 250                 if actual != tc.output {
 251                         t.Errorf("%q.ReplaceAll(%q,%q) = %q; want %q",
 252                                 tc.pattern, tc.input, tc.replacement, actual, tc.output)
 253                 }
 254         }
 255 }
 256
 257 func TestReplaceAllLiteral(t *testing.T) {
 258         // Run ReplaceAll tests that do not have $ expansions.
 259         for _, tc := range replaceTests {
 260                 if strings.Contains(tc.replacement, "$") {
 261                         continue
 262                 }
 263                 re, err := Compile(tc.pattern)
 264                 if err != nil {
 265                         t.Errorf("Unexpected error compiling %q: %v", tc.pattern, err)
 266                         continue
 267                 }
 268                 actual := re.ReplaceAllLiteralString(tc.input, tc.replacement)
 269                 if actual != tc.output {
 270                         t.Errorf("%q.ReplaceAllLiteralString(%q,%q) = %q; want %q",
 271                                 tc.pattern, tc.input, tc.replacement, actual, tc.output)
 272                 }
 273                 // now try bytes
 274                 actual = string(re.ReplaceAllLiteral([]byte(tc.input), []byte(tc.replacement)))
 275                 if actual != tc.output {
 276                         t.Errorf("%q.ReplaceAllLiteral(%q,%q) = %q; want %q",
 277                                 tc.pattern, tc.input, tc.replacement, actual, tc.output)
 278                 }
 279         }
 280
 281         // Run literal-specific tests.
 282         for _, tc := range replaceLiteralTests {
 283                 re, err := Compile(tc.pattern)
 284                 if err != nil {
 285                         t.Errorf("Unexpected error compiling %q: %v", tc.pattern, err)
 286                         continue
 287                 }
 288                 actual := re.ReplaceAllLiteralString(tc.input, tc.replacement)
 289                 if actual != tc.output {
 290                         t.Errorf("%q.ReplaceAllLiteralString(%q,%q) = %q; want %q",
 291                                 tc.pattern, tc.input, tc.replacement, actual, tc.output)
 292                 }
 293                 // now try bytes
 294                 actual = string(re.ReplaceAllLiteral([]byte(tc.input), []byte(tc.replacement)))
 295                 if actual != tc.output {
 296                         t.Errorf("%q.ReplaceAllLiteral(%q,%q) = %q; want %q",
 297                                 tc.pattern, tc.input, tc.replacement, actual, tc.output)
 298                 }
 299         }
 300 }
 301
 302 func TestReplaceAllFunc(t *testing.T) {
 303         for _, tc := range replaceFuncTests {
 304                 re, err := Compile(tc.pattern)
 305                 if err != nil {
 306                         t.Errorf("Unexpected error compiling %q: %v", tc.pattern, err)
 307                         continue
 308                 }
 309                 actual := re.ReplaceAllStringFunc(tc.input, tc.replacement)
 310                 if actual != tc.output {
 311                         t.Errorf("%q.ReplaceFunc(%q,fn) = %q; want %q",
 312                                 tc.pattern, tc.input, actual, tc.output)
 313                 }
 314                 // now try bytes
 315                 actual = string(re.ReplaceAllFunc([]byte(tc.input), func(s []byte) []byte { return []byte(tc.replacement(string(s))) }))
 316                 if actual != tc.output {
 317                         t.Errorf("%q.ReplaceFunc(%q,fn) = %q; want %q",
 318                                 tc.pattern, tc.input, actual, tc.output)
 319                 }
 320         }
 321 }
 322
 323 type MetaTest struct {
 324         pattern, output, literal string
 325         isLiteral                bool
 326 }
 327
 328 var metaTests = []MetaTest{
 329         {``, ``, ``, true},
 330         {`foo`, `foo`, `foo`, true},
 331         {`foo\.\$`, `foo\\\.\\\$`, `foo.$`, true}, // has meta but no operator
 332         {`foo.\$`, `foo\.\\\$`, `foo`, false},     // has escaped operators and real operators
 333         {`!@#$%^&*()_+-=[{]}\|,<.>/?~`, `!@#\$%\^&\*\(\)_\+-=\[\{\]\}\\\|,<\.>/\?~`, `!@#`, false},
 334 }
 335
 336 func TestQuoteMeta(t *testing.T) {
 337         for _, tc := range metaTests {
 338                 // Verify that QuoteMeta returns the expected string.
 339                 quoted := QuoteMeta(tc.pattern)
 340                 if quoted != tc.output {
 341                         t.Errorf("QuoteMeta(`%s`) = `%s`; want `%s`",
 342                                 tc.pattern, quoted, tc.output)
 343                         continue
 344                 }
 345
 346                 // Verify that the quoted string is in fact treated as expected
 347                 // by Compile -- i.e. that it matches the original, unquoted string.
 348                 if tc.pattern != "" {
 349                         re, err := Compile(quoted)
 350                         if err != nil {
 351                                 t.Errorf("Unexpected error compiling QuoteMeta(`%s`): %v", tc.pattern, err)
 352                                 continue
 353                         }
 354                         src := "abc" + tc.pattern + "def"
 355                         repl := "xyz"
 356                         replaced := re.ReplaceAllString(src, repl)
 357                         expected := "abcxyzdef"
 358                         if replaced != expected {
 359                                 t.Errorf("QuoteMeta(`%s`).Replace(`%s`,`%s`) = `%s`; want `%s`",
 360                                         tc.pattern, src, repl, replaced, expected)
 361                         }
 362                 }
 363         }
 364 }
 365
 366 func TestLiteralPrefix(t *testing.T) {
 367         for _, tc := range metaTests {
 368                 // Literal method needs to scan the pattern.
 369                 re := MustCompile(tc.pattern)
 370                 str, complete := re.LiteralPrefix()
 371                 if complete != tc.isLiteral {
 372                         t.Errorf("LiteralPrefix(`%s`) = %t; want %t", tc.pattern, complete, tc.isLiteral)
 373                 }
 374                 if str != tc.literal {
 375                         t.Errorf("LiteralPrefix(`%s`) = `%s`; want `%s`", tc.pattern, str, tc.literal)
 376                 }
 377         }
 378 }
 379
 380 type subexpCase struct {
 381         input string
 382         num   int
 383         names []string
 384 }
 385
 386 var subexpCases = []subexpCase{
 387         {``, 0, nil},
 388         {`.*`, 0, nil},
 389         {`abba`, 0, nil},
 390         {`ab(b)a`, 1, []string{"", ""}},
 391         {`ab(.*)a`, 1, []string{"", ""}},
 392         {`(.*)ab(.*)a`, 2, []string{"", "", ""}},
 393         {`(.*)(ab)(.*)a`, 3, []string{"", "", "", ""}},
 394         {`(.*)((a)b)(.*)a`, 4, []string{"", "", "", "", ""}},
 395         {`(.*)(\(ab)(.*)a`, 3, []string{"", "", "", ""}},
 396         {`(.*)(\(a\)b)(.*)a`, 3, []string{"", "", "", ""}},
 397         {`(?P<foo>.*)(?P<bar>(a)b)(?P<foo>.*)a`, 4, []string{"", "foo", "bar", "", "foo"}},
 398 }
 399
 400 func TestSubexp(t *testing.T) {
 401         for _, c := range subexpCases {
 402                 re := MustCompile(c.input)
 403                 n := re.NumSubexp()
 404                 if n != c.num {
 405                         t.Errorf("%q: NumSubexp = %d, want %d", c.input, n, c.num)
 406                         continue
 407                 }
 408                 names := re.SubexpNames()
 409                 if len(names) != 1+n {
 410                         t.Errorf("%q: len(SubexpNames) = %d, want %d", c.input, len(names), n)
 411                         continue
 412                 }
 413                 if c.names != nil {
 414                         for i := 0; i < 1+n; i++ {
 415                                 if names[i] != c.names[i] {
 416                                         t.Errorf("%q: SubexpNames[%d] = %q, want %q", c.input, i, names[i], c.names[i])
 417                                 }
 418                         }
 419                 }
 420         }
 421 }
 422
 423 var splitTests = []struct {
 424         s   string
 425         r   string
 426         n   int
 427         out []string
 428 }{
 429         {"foo:and:bar", ":", -1, []string{"foo", "and", "bar"}},
 430         {"foo:and:bar", ":", 1, []string{"foo:and:bar"}},
 431         {"foo:and:bar", ":", 2, []string{"foo", "and:bar"}},
 432         {"foo:and:bar", "foo", -1, []string{"", ":and:bar"}},
 433         {"foo:and:bar", "bar", -1, []string{"foo:and:", ""}},
 434         {"foo:and:bar", "baz", -1, []string{"foo:and:bar"}},
 435         {"baabaab", "a", -1, []string{"b", "", "b", "", "b"}},
 436         {"baabaab", "a*", -1, []string{"b", "b", "b"}},
 437         {"baabaab", "ba*", -1, []string{"", "", "", ""}},
 438         {"foobar", "f*b*", -1, []string{"", "o", "o", "a", "r"}},
 439         {"foobar", "f+.*b+", -1, []string{"", "ar"}},
 440         {"foobooboar", "o{2}", -1, []string{"f", "b", "boar"}},
 441         {"a,b,c,d,e,f", ",", 3, []string{"a", "b", "c,d,e,f"}},
 442         {"a,b,c,d,e,f", ",", 0, nil},
 443         {",", ",", -1, []string{"", ""}},
 444         {",,,", ",", -1, []string{"", "", "", ""}},
 445         {"", ",", -1, []string{""}},
 446         {"", ".*", -1, []string{""}},
 447         {"", ".+", -1, []string{""}},
 448         {"", "", -1, []string{}},
 449         {"foobar", "", -1, []string{"f", "o", "o", "b", "a", "r"}},
 450         {"abaabaccadaaae", "a*", 5, []string{"", "b", "b", "c", "cadaaae"}},
 451         {":x:y:z:", ":", -1, []string{"", "x", "y", "z", ""}},
 452 }
 453
 454 func TestSplit(t *testing.T) {
 455         for i, test := range splitTests {
 456                 re, err := Compile(test.r)
 457                 if err != nil {
 458                         t.Errorf("#%d: %q: compile error: %s", i, test.r, err.Error())
 459                         continue
 460                 }
 461
 462                 split := re.Split(test.s, test.n)
 463                 if !reflect.DeepEqual(split, test.out) {
 464                         t.Errorf("#%d: %q: got %q; want %q", i, test.r, split, test.out)
 465                 }
 466
 467                 if QuoteMeta(test.r) == test.r {
 468                         strsplit := strings.SplitN(test.s, test.r, test.n)
 469                         if !reflect.DeepEqual(split, strsplit) {
 470                                 t.Errorf("#%d: Split(%q, %q, %d): regexp vs strings mismatch\nregexp=%q\nstrings=%q", i, test.s, test.r, test.n, split, strsplit)
 471                         }
 472                 }
 473         }
 474 }
 475
 476 func BenchmarkLiteral(b *testing.B) {
 477         x := strings.Repeat("x", 50) + "y"
 478         b.StopTimer()
 479         re := MustCompile("y")
 480         b.StartTimer()
 481         for i := 0; i < b.N; i++ {
 482                 if !re.MatchString(x) {
 483                         b.Fatalf("no match!")
 484                 }
 485         }
 486 }
 487
 488 func BenchmarkNotLiteral(b *testing.B) {
 489         x := strings.Repeat("x", 50) + "y"
 490         b.StopTimer()
 491         re := MustCompile(".y")
 492         b.StartTimer()
 493         for i := 0; i < b.N; i++ {
 494                 if !re.MatchString(x) {
 495                         b.Fatalf("no match!")
 496                 }
 497         }
 498 }
 499
 500 func BenchmarkMatchClass(b *testing.B) {
 501         b.StopTimer()
 502         x := strings.Repeat("xxxx", 20) + "w"
 503         re := MustCompile("[abcdw]")
 504         b.StartTimer()
 505         for i := 0; i < b.N; i++ {
 506                 if !re.MatchString(x) {
 507                         b.Fatalf("no match!")
 508                 }
 509         }
 510 }
 511
 512 func BenchmarkMatchClass_InRange(b *testing.B) {
 513         b.StopTimer()
 514         // 'b' is between 'a' and 'c', so the charclass
 515         // range checking is no help here.
 516         x := strings.Repeat("bbbb", 20) + "c"
 517         re := MustCompile("[ac]")
 518         b.StartTimer()
 519         for i := 0; i < b.N; i++ {
 520                 if !re.MatchString(x) {
 521                         b.Fatalf("no match!")
 522                 }
 523         }
 524 }
 525
 526 func BenchmarkReplaceAll(b *testing.B) {
 527         x := "abcdefghijklmnopqrstuvwxyz"
 528         b.StopTimer()
 529         re := MustCompile("[cjrw]")
 530         b.StartTimer()
 531         for i := 0; i < b.N; i++ {
 532                 re.ReplaceAllString(x, "")
 533         }
 534 }
 535
 536 func BenchmarkAnchoredLiteralShortNonMatch(b *testing.B) {
 537         b.StopTimer()
 538         x := []byte("abcdefghijklmnopqrstuvwxyz")
 539         re := MustCompile("^zbc(d|e)")
 540         b.StartTimer()
 541         for i := 0; i < b.N; i++ {
 542                 re.Match(x)
 543         }
 544 }
 545
 546 func BenchmarkAnchoredLiteralLongNonMatch(b *testing.B) {
 547         b.StopTimer()
 548         x := []byte("abcdefghijklmnopqrstuvwxyz")
 549         for i := 0; i < 15; i++ {
 550                 x = append(x, x...)
 551         }
 552         re := MustCompile("^zbc(d|e)")
 553         b.StartTimer()
 554         for i := 0; i < b.N; i++ {
 555                 re.Match(x)
 556         }
 557 }
 558
 559 func BenchmarkAnchoredShortMatch(b *testing.B) {
 560         b.StopTimer()
 561         x := []byte("abcdefghijklmnopqrstuvwxyz")
 562         re := MustCompile("^.bc(d|e)")
 563         b.StartTimer()
 564         for i := 0; i < b.N; i++ {
 565                 re.Match(x)
 566         }
 567 }
 568
 569 func BenchmarkAnchoredLongMatch(b *testing.B) {
 570         b.StopTimer()
 571         x := []byte("abcdefghijklmnopqrstuvwxyz")
 572         for i := 0; i < 15; i++ {
 573                 x = append(x, x...)
 574         }
 575         re := MustCompile("^.bc(d|e)")
 576         b.StartTimer()
 577         for i := 0; i < b.N; i++ {
 578                 re.Match(x)
 579         }
 580 }