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         "regexp/syntax"
  10         "strings"
  11         "testing"
  12 )
  13
  14 var good_re = []string{
  15         ``,
  16         `.`,
  17         `^.$`,
  18         `a`,
  19         `a*`,
  20         `a+`,
  21         `a?`,
  22         `a|b`,
  23         `a*|b*`,
  24         `(a*|b)(c*|d)`,
  25         `[a-z]`,
  26         `[a-abc-c\-\]\[]`,
  27         `[a-z]+`,
  28         `[abc]`,
  29         `[^1234]`,
  30         `[^\n]`,
  31         `\!\\`,
  32 }
  33
  34 type stringError struct {
  35         re  string
  36         err string
  37 }
  38
  39 var bad_re = []stringError{
  40         {`*`, "missing argument to repetition operator: `*`"},
  41         {`+`, "missing argument to repetition operator: `+`"},
  42         {`?`, "missing argument to repetition operator: `?`"},
  43         {`(abc`, "missing closing ): `(abc`"},
  44         {`abc)`, "unexpected ): `abc)`"},
  45         {`x[a-z`, "missing closing ]: `[a-z`"},
  46         {`[z-a]`, "invalid character class range: `z-a`"},
  47         {`abc\`, "trailing backslash at end of expression"},
  48         {`a**`, "invalid nested repetition operator: `**`"},
  49         {`a*+`, "invalid nested repetition operator: `*+`"},
  50         {`\x`, "invalid escape sequence: `\\x`"},
  51 }
  52
  53 func compileTest(t *testing.T, expr string, error string) *Regexp {
  54         re, err := Compile(expr)
  55         if error == "" && err != nil {
  56                 t.Error("compiling `", expr, "`; unexpected error: ", err.Error())
  57         }
  58         if error != "" && err == nil {
  59                 t.Error("compiling `", expr, "`; missing error")
  60         } else if error != "" && !strings.Contains(err.Error(), error) {
  61                 t.Error("compiling `", expr, "`; wrong error: ", err.Error(), "; want ", error)
  62         }
  63         return re
  64 }
  65
  66 func TestGoodCompile(t *testing.T) {
  67         for i := 0; i < len(good_re); i++ {
  68                 compileTest(t, good_re[i], "")
  69         }
  70 }
  71
  72 func TestBadCompile(t *testing.T) {
  73         for i := 0; i < len(bad_re); i++ {
  74                 compileTest(t, bad_re[i].re, bad_re[i].err)
  75         }
  76 }
  77
  78 func matchTest(t *testing.T, test *FindTest) {
  79         re := compileTest(t, test.pat, "")
  80         if re == nil {
  81                 return
  82         }
  83         m := re.MatchString(test.text)
  84         if m != (len(test.matches) > 0) {
  85                 t.Errorf("MatchString failure on %s: %t should be %t", test, m, len(test.matches) > 0)
  86         }
  87         // now try bytes
  88         m = re.Match([]byte(test.text))
  89         if m != (len(test.matches) > 0) {
  90                 t.Errorf("Match failure on %s: %t should be %t", test, m, len(test.matches) > 0)
  91         }
  92 }
  93
  94 func TestMatch(t *testing.T) {
  95         for _, test := range findTests {
  96                 matchTest(t, &test)
  97         }
  98 }
  99
 100 func matchFunctionTest(t *testing.T, test *FindTest) {
 101         m, err := MatchString(test.pat, test.text)
 102         if err == nil {
 103                 return
 104         }
 105         if m != (len(test.matches) > 0) {
 106                 t.Errorf("Match failure on %s: %t should be %t", test, m, len(test.matches) > 0)
 107         }
 108 }
 109
 110 func TestMatchFunction(t *testing.T) {
 111         for _, test := range findTests {
 112                 matchFunctionTest(t, &test)
 113         }
 114 }
 115
 116 type ReplaceTest struct {
 117         pattern, replacement, input, output string
 118 }
 119
 120 var replaceTests = []ReplaceTest{
 121         // Test empty input and/or replacement, with pattern that matches the empty string.
 122         {"", "", "", ""},
 123         {"", "x", "", "x"},
 124         {"", "", "abc", "abc"},
 125         {"", "x", "abc", "xaxbxcx"},
 126
 127         // Test empty input and/or replacement, with pattern that does not match the empty string.
 128         {"b", "", "", ""},
 129         {"b", "x", "", ""},
 130         {"b", "", "abc", "ac"},
 131         {"b", "x", "abc", "axc"},
 132         {"y", "", "", ""},
 133         {"y", "x", "", ""},
 134         {"y", "", "abc", "abc"},
 135         {"y", "x", "abc", "abc"},
 136
 137         // Multibyte characters -- verify that we don't try to match in the middle
 138         // of a character.
 139         {"[a-c]*", "x", "\u65e5", "x\u65e5x"},
 140         {"[^\u65e5]", "x", "abc\u65e5def", "xxx\u65e5xxx"},
 141
 142         // Start and end of a string.
 143         {"^[a-c]*", "x", "abcdabc", "xdabc"},
 144         {"[a-c]*$", "x", "abcdabc", "abcdx"},
 145         {"^[a-c]*$", "x", "abcdabc", "abcdabc"},
 146         {"^[a-c]*", "x", "abc", "x"},
 147         {"[a-c]*$", "x", "abc", "x"},
 148         {"^[a-c]*$", "x", "abc", "x"},
 149         {"^[a-c]*", "x", "dabce", "xdabce"},
 150         {"[a-c]*$", "x", "dabce", "dabcex"},
 151         {"^[a-c]*$", "x", "dabce", "dabce"},
 152         {"^[a-c]*", "x", "", "x"},
 153         {"[a-c]*$", "x", "", "x"},
 154         {"^[a-c]*$", "x", "", "x"},
 155
 156         {"^[a-c]+", "x", "abcdabc", "xdabc"},
 157         {"[a-c]+$", "x", "abcdabc", "abcdx"},
 158         {"^[a-c]+$", "x", "abcdabc", "abcdabc"},
 159         {"^[a-c]+", "x", "abc", "x"},
 160         {"[a-c]+$", "x", "abc", "x"},
 161         {"^[a-c]+$", "x", "abc", "x"},
 162         {"^[a-c]+", "x", "dabce", "dabce"},
 163         {"[a-c]+$", "x", "dabce", "dabce"},
 164         {"^[a-c]+$", "x", "dabce", "dabce"},
 165         {"^[a-c]+", "x", "", ""},
 166         {"[a-c]+$", "x", "", ""},
 167         {"^[a-c]+$", "x", "", ""},
 168
 169         // Other cases.
 170         {"abc", "def", "abcdefg", "defdefg"},
 171         {"bc", "BC", "abcbcdcdedef", "aBCBCdcdedef"},
 172         {"abc", "", "abcdabc", "d"},
 173         {"x", "xXx", "xxxXxxx", "xXxxXxxXxXxXxxXxxXx"},
 174         {"abc", "d", "", ""},
 175         {"abc", "d", "abc", "d"},
 176         {".+", "x", "abc", "x"},
 177         {"[a-c]*", "x", "def", "xdxexfx"},
 178         {"[a-c]+", "x", "abcbcdcdedef", "xdxdedef"},
 179         {"[a-c]*", "x", "abcbcdcdedef", "xdxdxexdxexfx"},
 180
 181         // Substitutions
 182         {"a+", "($0)", "banana", "b(a)n(a)n(a)"},
 183         {"a+", "(${0})", "banana", "b(a)n(a)n(a)"},
 184         {"a+", "(${0})$0", "banana", "b(a)an(a)an(a)a"},
 185         {"a+", "(${0})$0", "banana", "b(a)an(a)an(a)a"},
 186         {"hello, (.+)", "goodbye, ${1}", "hello, world", "goodbye, world"},
 187         {"hello, (.+)", "goodbye, $1x", "hello, world", "goodbye, "},
 188         {"hello, (.+)", "goodbye, ${1}x", "hello, world", "goodbye, worldx"},
 189         {"hello, (.+)", "<$0><$1><$2><$3>", "hello, world", "<hello, world><world><><>"},
 190         {"hello, (?P<noun>.+)", "goodbye, $noun!", "hello, world", "goodbye, world!"},
 191         {"hello, (?P<noun>.+)", "goodbye, ${noun}", "hello, world", "goodbye, world"},
 192         {"(?P<x>hi)|(?P<x>bye)", "$x$x$x", "hi", "hihihi"},
 193         {"(?P<x>hi)|(?P<x>bye)", "$x$x$x", "bye", "byebyebye"},
 194         {"(?P<x>hi)|(?P<x>bye)", "$xyz", "hi", ""},
 195         {"(?P<x>hi)|(?P<x>bye)", "${x}yz", "hi", "hiyz"},
 196         {"(?P<x>hi)|(?P<x>bye)", "hello $$x", "hi", "hello $x"},
 197         {"a+", "${oops", "aaa", "${oops"},
 198         {"a+", "$$", "aaa", "$"},
 199         {"a+", "$", "aaa", "$"},
 200
 201         // Substitution when subexpression isn't found
 202         {"(x)?", "$1", "123", "123"},
 203         {"abc", "$1", "123", "123"},
 204 }
 205
 206 var replaceLiteralTests = []ReplaceTest{
 207         // Substitutions
 208         {"a+", "($0)", "banana", "b($0)n($0)n($0)"},
 209         {"a+", "(${0})", "banana", "b(${0})n(${0})n(${0})"},
 210         {"a+", "(${0})$0", "banana", "b(${0})$0n(${0})$0n(${0})$0"},
 211         {"a+", "(${0})$0", "banana", "b(${0})$0n(${0})$0n(${0})$0"},
 212         {"hello, (.+)", "goodbye, ${1}", "hello, world", "goodbye, ${1}"},
 213         {"hello, (?P<noun>.+)", "goodbye, $noun!", "hello, world", "goodbye, $noun!"},
 214         {"hello, (?P<noun>.+)", "goodbye, ${noun}", "hello, world", "goodbye, ${noun}"},
 215         {"(?P<x>hi)|(?P<x>bye)", "$x$x$x", "hi", "$x$x$x"},
 216         {"(?P<x>hi)|(?P<x>bye)", "$x$x$x", "bye", "$x$x$x"},
 217         {"(?P<x>hi)|(?P<x>bye)", "$xyz", "hi", "$xyz"},
 218         {"(?P<x>hi)|(?P<x>bye)", "${x}yz", "hi", "${x}yz"},
 219         {"(?P<x>hi)|(?P<x>bye)", "hello $$x", "hi", "hello $$x"},
 220         {"a+", "${oops", "aaa", "${oops"},
 221         {"a+", "$$", "aaa", "$$"},
 222         {"a+", "$", "aaa", "$"},
 223 }
 224
 225 type ReplaceFuncTest struct {
 226         pattern       string
 227         replacement   func(string) string
 228         input, output string
 229 }
 230
 231 var replaceFuncTests = []ReplaceFuncTest{
 232         {"[a-c]", func(s string) string { return "x" + s + "y" }, "defabcdef", "defxayxbyxcydef"},
 233         {"[a-c]+", func(s string) string { return "x" + s + "y" }, "defabcdef", "defxabcydef"},
 234         {"[a-c]*", func(s string) string { return "x" + s + "y" }, "defabcdef", "xydxyexyfxabcydxyexyfxy"},
 235 }
 236
 237 func TestReplaceAll(t *testing.T) {
 238         for _, tc := range replaceTests {
 239                 re, err := Compile(tc.pattern)
 240                 if err != nil {
 241                         t.Errorf("Unexpected error compiling %q: %v", tc.pattern, err)
 242                         continue
 243                 }
 244                 actual := re.ReplaceAllString(tc.input, tc.replacement)
 245                 if actual != tc.output {
 246                         t.Errorf("%q.ReplaceAllString(%q,%q) = %q; want %q",
 247                                 tc.pattern, tc.input, tc.replacement, actual, tc.output)
 248                 }
 249                 // now try bytes
 250                 actual = string(re.ReplaceAll([]byte(tc.input), []byte(tc.replacement)))
 251                 if actual != tc.output {
 252                         t.Errorf("%q.ReplaceAll(%q,%q) = %q; want %q",
 253                                 tc.pattern, tc.input, tc.replacement, actual, tc.output)
 254                 }
 255         }
 256 }
 257
 258 func TestReplaceAllLiteral(t *testing.T) {
 259         // Run ReplaceAll tests that do not have $ expansions.
 260         for _, tc := range replaceTests {
 261                 if strings.Contains(tc.replacement, "$") {
 262                         continue
 263                 }
 264                 re, err := Compile(tc.pattern)
 265                 if err != nil {
 266                         t.Errorf("Unexpected error compiling %q: %v", tc.pattern, err)
 267                         continue
 268                 }
 269                 actual := re.ReplaceAllLiteralString(tc.input, tc.replacement)
 270                 if actual != tc.output {
 271                         t.Errorf("%q.ReplaceAllLiteralString(%q,%q) = %q; want %q",
 272                                 tc.pattern, tc.input, tc.replacement, actual, tc.output)
 273                 }
 274                 // now try bytes
 275                 actual = string(re.ReplaceAllLiteral([]byte(tc.input), []byte(tc.replacement)))
 276                 if actual != tc.output {
 277                         t.Errorf("%q.ReplaceAllLiteral(%q,%q) = %q; want %q",
 278                                 tc.pattern, tc.input, tc.replacement, actual, tc.output)
 279                 }
 280         }
 281
 282         // Run literal-specific tests.
 283         for _, tc := range replaceLiteralTests {
 284                 re, err := Compile(tc.pattern)
 285                 if err != nil {
 286                         t.Errorf("Unexpected error compiling %q: %v", tc.pattern, err)
 287                         continue
 288                 }
 289                 actual := re.ReplaceAllLiteralString(tc.input, tc.replacement)
 290                 if actual != tc.output {
 291                         t.Errorf("%q.ReplaceAllLiteralString(%q,%q) = %q; want %q",
 292                                 tc.pattern, tc.input, tc.replacement, actual, tc.output)
 293                 }
 294                 // now try bytes
 295                 actual = string(re.ReplaceAllLiteral([]byte(tc.input), []byte(tc.replacement)))
 296                 if actual != tc.output {
 297                         t.Errorf("%q.ReplaceAllLiteral(%q,%q) = %q; want %q",
 298                                 tc.pattern, tc.input, tc.replacement, actual, tc.output)
 299                 }
 300         }
 301 }
 302
 303 func TestReplaceAllFunc(t *testing.T) {
 304         for _, tc := range replaceFuncTests {
 305                 re, err := Compile(tc.pattern)
 306                 if err != nil {
 307                         t.Errorf("Unexpected error compiling %q: %v", tc.pattern, err)
 308                         continue
 309                 }
 310                 actual := re.ReplaceAllStringFunc(tc.input, tc.replacement)
 311                 if actual != tc.output {
 312                         t.Errorf("%q.ReplaceFunc(%q,fn) = %q; want %q",
 313                                 tc.pattern, tc.input, actual, tc.output)
 314                 }
 315                 // now try bytes
 316                 actual = string(re.ReplaceAllFunc([]byte(tc.input), func(s []byte) []byte { return []byte(tc.replacement(string(s))) }))
 317                 if actual != tc.output {
 318                         t.Errorf("%q.ReplaceFunc(%q,fn) = %q; want %q",
 319                                 tc.pattern, tc.input, actual, tc.output)
 320                 }
 321         }
 322 }
 323
 324 type MetaTest struct {
 325         pattern, output, literal string
 326         isLiteral                bool
 327 }
 328
 329 var metaTests = []MetaTest{
 330         {``, ``, ``, true},
 331         {`foo`, `foo`, `foo`, true},
 332         {`foo\.\$`, `foo\\\.\\\$`, `foo.$`, true}, // has meta but no operator
 333         {`foo.\$`, `foo\.\\\$`, `foo`, false},     // has escaped operators and real operators
 334         {`!@#$%^&*()_+-=[{]}\|,<.>/?~`, `!@#\$%\^&\*\(\)_\+-=\[\{\]\}\\\|,<\.>/\?~`, `!@#`, false},
 335 }
 336
 337 func TestQuoteMeta(t *testing.T) {
 338         for _, tc := range metaTests {
 339                 // Verify that QuoteMeta returns the expected string.
 340                 quoted := QuoteMeta(tc.pattern)
 341                 if quoted != tc.output {
 342                         t.Errorf("QuoteMeta(`%s`) = `%s`; want `%s`",
 343                                 tc.pattern, quoted, tc.output)
 344                         continue
 345                 }
 346
 347                 // Verify that the quoted string is in fact treated as expected
 348                 // by Compile -- i.e. that it matches the original, unquoted string.
 349                 if tc.pattern != "" {
 350                         re, err := Compile(quoted)
 351                         if err != nil {
 352                                 t.Errorf("Unexpected error compiling QuoteMeta(`%s`): %v", tc.pattern, err)
 353                                 continue
 354                         }
 355                         src := "abc" + tc.pattern + "def"
 356                         repl := "xyz"
 357                         replaced := re.ReplaceAllString(src, repl)
 358                         expected := "abcxyzdef"
 359                         if replaced != expected {
 360                                 t.Errorf("QuoteMeta(`%s`).Replace(`%s`,`%s`) = `%s`; want `%s`",
 361                                         tc.pattern, src, repl, replaced, expected)
 362                         }
 363                 }
 364         }
 365 }
 366
 367 func TestLiteralPrefix(t *testing.T) {
 368         for _, tc := range metaTests {
 369                 // Literal method needs to scan the pattern.
 370                 re := MustCompile(tc.pattern)
 371                 str, complete := re.LiteralPrefix()
 372                 if complete != tc.isLiteral {
 373                         t.Errorf("LiteralPrefix(`%s`) = %t; want %t", tc.pattern, complete, tc.isLiteral)
 374                 }
 375                 if str != tc.literal {
 376                         t.Errorf("LiteralPrefix(`%s`) = `%s`; want `%s`", tc.pattern, str, tc.literal)
 377                 }
 378         }
 379 }
 380
 381 type subexpCase struct {
 382         input string
 383         num   int
 384         names []string
 385 }
 386
 387 var subexpCases = []subexpCase{
 388         {``, 0, nil},
 389         {`.*`, 0, nil},
 390         {`abba`, 0, nil},
 391         {`ab(b)a`, 1, []string{"", ""}},
 392         {`ab(.*)a`, 1, []string{"", ""}},
 393         {`(.*)ab(.*)a`, 2, []string{"", "", ""}},
 394         {`(.*)(ab)(.*)a`, 3, []string{"", "", "", ""}},
 395         {`(.*)((a)b)(.*)a`, 4, []string{"", "", "", "", ""}},
 396         {`(.*)(\(ab)(.*)a`, 3, []string{"", "", "", ""}},
 397         {`(.*)(\(a\)b)(.*)a`, 3, []string{"", "", "", ""}},
 398         {`(?P<foo>.*)(?P<bar>(a)b)(?P<foo>.*)a`, 4, []string{"", "foo", "bar", "", "foo"}},
 399 }
 400
 401 func TestSubexp(t *testing.T) {
 402         for _, c := range subexpCases {
 403                 re := MustCompile(c.input)
 404                 n := re.NumSubexp()
 405                 if n != c.num {
 406                         t.Errorf("%q: NumSubexp = %d, want %d", c.input, n, c.num)
 407                         continue
 408                 }
 409                 names := re.SubexpNames()
 410                 if len(names) != 1+n {
 411                         t.Errorf("%q: len(SubexpNames) = %d, want %d", c.input, len(names), n)
 412                         continue
 413                 }
 414                 if c.names != nil {
 415                         for i := 0; i < 1+n; i++ {
 416                                 if names[i] != c.names[i] {
 417                                         t.Errorf("%q: SubexpNames[%d] = %q, want %q", c.input, i, names[i], c.names[i])
 418                                 }
 419                         }
 420                 }
 421         }
 422 }
 423
 424 var splitTests = []struct {
 425         s   string
 426         r   string
 427         n   int
 428         out []string
 429 }{
 430         {"foo:and:bar", ":", -1, []string{"foo", "and", "bar"}},
 431         {"foo:and:bar", ":", 1, []string{"foo:and:bar"}},
 432         {"foo:and:bar", ":", 2, []string{"foo", "and:bar"}},
 433         {"foo:and:bar", "foo", -1, []string{"", ":and:bar"}},
 434         {"foo:and:bar", "bar", -1, []string{"foo:and:", ""}},
 435         {"foo:and:bar", "baz", -1, []string{"foo:and:bar"}},
 436         {"baabaab", "a", -1, []string{"b", "", "b", "", "b"}},
 437         {"baabaab", "a*", -1, []string{"b", "b", "b"}},
 438         {"baabaab", "ba*", -1, []string{"", "", "", ""}},
 439         {"foobar", "f*b*", -1, []string{"", "o", "o", "a", "r"}},
 440         {"foobar", "f+.*b+", -1, []string{"", "ar"}},
 441         {"foobooboar", "o{2}", -1, []string{"f", "b", "boar"}},
 442         {"a,b,c,d,e,f", ",", 3, []string{"a", "b", "c,d,e,f"}},
 443         {"a,b,c,d,e,f", ",", 0, nil},
 444         {",", ",", -1, []string{"", ""}},
 445         {",,,", ",", -1, []string{"", "", "", ""}},
 446         {"", ",", -1, []string{""}},
 447         {"", ".*", -1, []string{""}},
 448         {"", ".+", -1, []string{""}},
 449         {"", "", -1, []string{}},
 450         {"foobar", "", -1, []string{"f", "o", "o", "b", "a", "r"}},
 451         {"abaabaccadaaae", "a*", 5, []string{"", "b", "b", "c", "cadaaae"}},
 452         {":x:y:z:", ":", -1, []string{"", "x", "y", "z", ""}},
 453 }
 454
 455 func TestSplit(t *testing.T) {
 456         for i, test := range splitTests {
 457                 re, err := Compile(test.r)
 458                 if err != nil {
 459                         t.Errorf("#%d: %q: compile error: %s", i, test.r, err.Error())
 460                         continue
 461                 }
 462
 463                 split := re.Split(test.s, test.n)
 464                 if !reflect.DeepEqual(split, test.out) {
 465                         t.Errorf("#%d: %q: got %q; want %q", i, test.r, split, test.out)
 466                 }
 467
 468                 if QuoteMeta(test.r) == test.r {
 469                         strsplit := strings.SplitN(test.s, test.r, test.n)
 470                         if !reflect.DeepEqual(split, strsplit) {
 471                                 t.Errorf("#%d: Split(%q, %q, %d): regexp vs strings mismatch\nregexp=%q\nstrings=%q", i, test.s, test.r, test.n, split, strsplit)
 472                         }
 473                 }
 474         }
 475 }
 476
 477 // Check that one-pass cutoff does trigger.
 478 func TestOnePassCutoff(t *testing.T) {
 479         re, err := syntax.Parse(`^x{1,1000}y{1,1000}$`, syntax.Perl)
 480         if err != nil {
 481                 t.Fatalf("parse: %v", err)
 482         }
 483         p, err := syntax.Compile(re.Simplify())
 484         if err != nil {
 485                 t.Fatalf("compile: %v", err)
 486         }
 487         if compileOnePass(p) != notOnePass {
 488                 t.Fatalf("makeOnePass succeeded; wanted notOnePass")
 489         }
 490 }
 491
 492 func BenchmarkLiteral(b *testing.B) {
 493         x := strings.Repeat("x", 50) + "y"
 494         b.StopTimer()
 495         re := MustCompile("y")
 496         b.StartTimer()
 497         for i := 0; i < b.N; i++ {
 498                 if !re.MatchString(x) {
 499                         b.Fatalf("no match!")
 500                 }
 501         }
 502 }
 503
 504 func BenchmarkNotLiteral(b *testing.B) {
 505         x := strings.Repeat("x", 50) + "y"
 506         b.StopTimer()
 507         re := MustCompile(".y")
 508         b.StartTimer()
 509         for i := 0; i < b.N; i++ {
 510                 if !re.MatchString(x) {
 511                         b.Fatalf("no match!")
 512                 }
 513         }
 514 }
 515
 516 func BenchmarkMatchClass(b *testing.B) {
 517         b.StopTimer()
 518         x := strings.Repeat("xxxx", 20) + "w"
 519         re := MustCompile("[abcdw]")
 520         b.StartTimer()
 521         for i := 0; i < b.N; i++ {
 522                 if !re.MatchString(x) {
 523                         b.Fatalf("no match!")
 524                 }
 525         }
 526 }
 527
 528 func BenchmarkMatchClass_InRange(b *testing.B) {
 529         b.StopTimer()
 530         // 'b' is between 'a' and 'c', so the charclass
 531         // range checking is no help here.
 532         x := strings.Repeat("bbbb", 20) + "c"
 533         re := MustCompile("[ac]")
 534         b.StartTimer()
 535         for i := 0; i < b.N; i++ {
 536                 if !re.MatchString(x) {
 537                         b.Fatalf("no match!")
 538                 }
 539         }
 540 }
 541
 542 func BenchmarkReplaceAll(b *testing.B) {
 543         x := "abcdefghijklmnopqrstuvwxyz"
 544         b.StopTimer()
 545         re := MustCompile("[cjrw]")
 546         b.StartTimer()
 547         for i := 0; i < b.N; i++ {
 548                 re.ReplaceAllString(x, "")
 549         }
 550 }
 551
 552 func BenchmarkAnchoredLiteralShortNonMatch(b *testing.B) {
 553         b.StopTimer()
 554         x := []byte("abcdefghijklmnopqrstuvwxyz")
 555         re := MustCompile("^zbc(d|e)")
 556         b.StartTimer()
 557         for i := 0; i < b.N; i++ {
 558                 re.Match(x)
 559         }
 560 }
 561
 562 func BenchmarkAnchoredLiteralLongNonMatch(b *testing.B) {
 563         b.StopTimer()
 564         x := []byte("abcdefghijklmnopqrstuvwxyz")
 565         for i := 0; i < 15; i++ {
 566                 x = append(x, x...)
 567         }
 568         re := MustCompile("^zbc(d|e)")
 569         b.StartTimer()
 570         for i := 0; i < b.N; i++ {
 571                 re.Match(x)
 572         }
 573 }
 574
 575 func BenchmarkAnchoredShortMatch(b *testing.B) {
 576         b.StopTimer()
 577         x := []byte("abcdefghijklmnopqrstuvwxyz")
 578         re := MustCompile("^.bc(d|e)")
 579         b.StartTimer()
 580         for i := 0; i < b.N; i++ {
 581                 re.Match(x)
 582         }
 583 }
 584
 585 func BenchmarkAnchoredLongMatch(b *testing.B) {
 586         b.StopTimer()
 587         x := []byte("abcdefghijklmnopqrstuvwxyz")
 588         for i := 0; i < 15; i++ {
 589                 x = append(x, x...)
 590         }
 591         re := MustCompile("^.bc(d|e)")
 592         b.StartTimer()
 593         for i := 0; i < b.N; i++ {
 594                 re.Match(x)
 595         }
 596 }
 597
 598 func BenchmarkOnePassShortA(b *testing.B) {
 599         b.StopTimer()
 600         x := []byte("abcddddddeeeededd")
 601         re := MustCompile("^.bc(d|e)*$")
 602         b.StartTimer()
 603         for i := 0; i < b.N; i++ {
 604                 re.Match(x)
 605         }
 606 }
 607
 608 func BenchmarkNotOnePassShortA(b *testing.B) {
 609         b.StopTimer()
 610         x := []byte("abcddddddeeeededd")
 611         re := MustCompile(".bc(d|e)*$")
 612         b.StartTimer()
 613         for i := 0; i < b.N; i++ {
 614                 re.Match(x)
 615         }
 616 }
 617
 618 func BenchmarkOnePassShortB(b *testing.B) {
 619         b.StopTimer()
 620         x := []byte("abcddddddeeeededd")
 621         re := MustCompile("^.bc(?:d|e)*$")
 622         b.StartTimer()
 623         for i := 0; i < b.N; i++ {
 624                 re.Match(x)
 625         }
 626 }
 627
 628 func BenchmarkNotOnePassShortB(b *testing.B) {
 629         b.StopTimer()
 630         x := []byte("abcddddddeeeededd")
 631         re := MustCompile(".bc(?:d|e)*$")
 632         b.StartTimer()
 633         for i := 0; i < b.N; i++ {
 634                 re.Match(x)
 635         }
 636 }
 637
 638 func BenchmarkOnePassLongPrefix(b *testing.B) {
 639         b.StopTimer()
 640         x := []byte("abcdefghijklmnopqrstuvwxyz")
 641         re := MustCompile("^abcdefghijklmnopqrstuvwxyz.*$")
 642         b.StartTimer()
 643         for i := 0; i < b.N; i++ {
 644                 re.Match(x)
 645         }
 646 }
 647
 648 func BenchmarkOnePassLongNotPrefix(b *testing.B) {
 649         b.StopTimer()
 650         x := []byte("abcdefghijklmnopqrstuvwxyz")
 651         re := MustCompile("^.bcdefghijklmnopqrstuvwxyz.*$")
 652         b.StartTimer()
 653         for i := 0; i < b.N; i++ {
 654                 re.Match(x)
 655         }
 656 }