// Copyright 2009 The Go Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. package regexp import ( "reflect" "regexp/syntax" "slices" "strings" "testing" "unicode/utf8" ) var goodRe = []string{ ``, `.`, `^.$`, `a`, `a*`, `a+`, `a?`, `a|b`, `a*|b*`, `(a*|b)(c*|d)`, `[a-z]`, `[a-abc-c\-\]\[]`, `[a-z]+`, `[abc]`, `[^1234]`, `[^\n]`, `\!\\`, } type stringError struct { re string err string } var badRe = []stringError{ {`*`, "missing argument to repetition operator: `*`"}, {`+`, "missing argument to repetition operator: `+`"}, {`?`, "missing argument to repetition operator: `?`"}, {`(abc`, "missing closing ): `(abc`"}, {`abc)`, "unexpected ): `abc)`"}, {`x[a-z`, "missing closing ]: `[a-z`"}, {`[z-a]`, "invalid character class range: `z-a`"}, {`abc\`, "trailing backslash at end of expression"}, {`a**`, "invalid nested repetition operator: `**`"}, {`a*+`, "invalid nested repetition operator: `*+`"}, {`\x`, "invalid escape sequence: `\\x`"}, {strings.Repeat(`\pL`, 27000), "expression too large"}, } func compileTest(t *testing.T, expr string, error string) *Regexp { re, err := Compile(expr) if error == "" && err != nil { t.Error("compiling `", expr, "`; unexpected error: ", err.Error()) } if error != "" && err == nil { t.Error("compiling `", expr, "`; missing error") } else if error != "" && !strings.Contains(err.Error(), error) { t.Error("compiling `", expr, "`; wrong error: ", err.Error(), "; want ", error) } return re } func TestGoodCompile(t *testing.T) { for i := 0; i < len(goodRe); i++ { compileTest(t, goodRe[i], "") } } func TestBadCompile(t *testing.T) { for i := 0; i < len(badRe); i++ { compileTest(t, badRe[i].re, badRe[i].err) } } func matchTest(t *testing.T, test *FindTest) { re := compileTest(t, test.pat, "") if re == nil { return } m := re.MatchString(test.text) if m != (len(test.matches) > 0) { t.Errorf("MatchString failure on %s: %t should be %t", test, m, len(test.matches) > 0) } // now try bytes m = re.Match([]byte(test.text)) if m != (len(test.matches) > 0) { t.Errorf("Match failure on %s: %t should be %t", test, m, len(test.matches) > 0) } } func TestMatch(t *testing.T) { for _, test := range findTests { matchTest(t, &test) } } func matchFunctionTest(t *testing.T, test *FindTest) { m, err := MatchString(test.pat, test.text) if err == nil { return } if m != (len(test.matches) > 0) { t.Errorf("Match failure on %s: %t should be %t", test, m, len(test.matches) > 0) } } func TestMatchFunction(t *testing.T) { for _, test := range findTests { matchFunctionTest(t, &test) } } func copyMatchTest(t *testing.T, test *FindTest) { re := compileTest(t, test.pat, "") if re == nil { return } m1 := re.MatchString(test.text) m2 := re.Copy().MatchString(test.text) if m1 != m2 { t.Errorf("Copied Regexp match failure on %s: original gave %t; copy gave %t; should be %t", test, m1, m2, len(test.matches) > 0) } } func TestCopyMatch(t *testing.T) { for _, test := range findTests { copyMatchTest(t, &test) } } type ReplaceTest struct { pattern, replacement, input, output string } var replaceTests = []ReplaceTest{ // Test empty input and/or replacement, with pattern that matches the empty string. {"", "", "", ""}, {"", "x", "", "x"}, {"", "", "abc", "abc"}, {"", "x", "abc", "xaxbxcx"}, // Test empty input and/or replacement, with pattern that does not match the empty string. {"b", "", "", ""}, {"b", "x", "", ""}, {"b", "", "abc", "ac"}, {"b", "x", "abc", "axc"}, {"y", "", "", ""}, {"y", "x", "", ""}, {"y", "", "abc", "abc"}, {"y", "x", "abc", "abc"}, // Multibyte characters -- verify that we don't try to match in the middle // of a character. {"[a-c]*", "x", "\u65e5", "x\u65e5x"}, {"[^\u65e5]", "x", "abc\u65e5def", "xxx\u65e5xxx"}, // Start and end of a string. {"^[a-c]*", "x", "abcdabc", "xdabc"}, {"[a-c]*$", "x", "abcdabc", "abcdx"}, {"^[a-c]*$", "x", "abcdabc", "abcdabc"}, {"^[a-c]*", "x", "abc", "x"}, {"[a-c]*$", "x", "abc", "x"}, {"^[a-c]*$", "x", "abc", "x"}, {"^[a-c]*", "x", "dabce", "xdabce"}, {"[a-c]*$", "x", "dabce", "dabcex"}, {"^[a-c]*$", "x", "dabce", "dabce"}, {"^[a-c]*", "x", "", "x"}, {"[a-c]*$", "x", "", "x"}, {"^[a-c]*$", "x", "", "x"}, {"^[a-c]+", "x", "abcdabc", "xdabc"}, {"[a-c]+$", "x", "abcdabc", "abcdx"}, {"^[a-c]+$", "x", "abcdabc", "abcdabc"}, {"^[a-c]+", "x", "abc", "x"}, {"[a-c]+$", "x", "abc", "x"}, {"^[a-c]+$", "x", "abc", "x"}, {"^[a-c]+", "x", "dabce", "dabce"}, {"[a-c]+$", "x", "dabce", "dabce"}, {"^[a-c]+$", "x", "dabce", "dabce"}, {"^[a-c]+", "x", "", ""}, {"[a-c]+$", "x", "", ""}, {"^[a-c]+$", "x", "", ""}, // Other cases. {"abc", "def", "abcdefg", "defdefg"}, {"bc", "BC", "abcbcdcdedef", "aBCBCdcdedef"}, {"abc", "", "abcdabc", "d"}, {"x", "xXx", "xxxXxxx", "xXxxXxxXxXxXxxXxxXx"}, {"abc", "d", "", ""}, {"abc", "d", "abc", "d"}, {".+", "x", "abc", "x"}, {"[a-c]*", "x", "def", "xdxexfx"}, {"[a-c]+", "x", "abcbcdcdedef", "xdxdedef"}, {"[a-c]*", "x", "abcbcdcdedef", "xdxdxexdxexfx"}, // Substitutions {"a+", "($0)", "banana", "b(a)n(a)n(a)"}, {"a+", "(${0})", "banana", "b(a)n(a)n(a)"}, {"a+", "(${0})$0", "banana", "b(a)an(a)an(a)a"}, {"a+", "(${0})$0", "banana", "b(a)an(a)an(a)a"}, {"hello, (.+)", "goodbye, ${1}", "hello, world", "goodbye, world"}, {"hello, (.+)", "goodbye, $1x", "hello, world", "goodbye, "}, {"hello, (.+)", "goodbye, ${1}x", "hello, world", "goodbye, worldx"}, {"hello, (.+)", "<$0><$1><$2><$3>", "hello, world", "<><>"}, {"hello, (?P.+)", "goodbye, $noun!", "hello, world", "goodbye, world!"}, {"hello, (?P.+)", "goodbye, ${noun}", "hello, world", "goodbye, world"}, {"(?Phi)|(?Pbye)", "$x$x$x", "hi", "hihihi"}, {"(?Phi)|(?Pbye)", "$x$x$x", "bye", "byebyebye"}, {"(?Phi)|(?Pbye)", "$xyz", "hi", ""}, {"(?Phi)|(?Pbye)", "${x}yz", "hi", "hiyz"}, {"(?Phi)|(?Pbye)", "hello $$x", "hi", "hello $x"}, {"a+", "${oops", "aaa", "${oops"}, {"a+", "$$", "aaa", "$"}, {"a+", "$", "aaa", "$"}, // Substitution when subexpression isn't found {"(x)?", "$1", "123", "123"}, {"abc", "$1", "123", "123"}, // Substitutions involving a (x){0} {"(a)(b){0}(c)", ".$1|$3.", "xacxacx", "x.a|c.x.a|c.x"}, {"(a)(((b))){0}c", ".$1.", "xacxacx", "x.a.x.a.x"}, {"((a(b){0}){3}){5}(h)", "y caramb$2", "say aaaaaaaaaaaaaaaah", "say ay caramba"}, {"((a(b){0}){3}){5}h", "y caramb$2", "say aaaaaaaaaaaaaaaah", "say ay caramba"}, } var replaceLiteralTests = []ReplaceTest{ // Substitutions {"a+", "($0)", "banana", "b($0)n($0)n($0)"}, {"a+", "(${0})", "banana", "b(${0})n(${0})n(${0})"}, {"a+", "(${0})$0", "banana", "b(${0})$0n(${0})$0n(${0})$0"}, {"a+", "(${0})$0", "banana", "b(${0})$0n(${0})$0n(${0})$0"}, {"hello, (.+)", "goodbye, ${1}", "hello, world", "goodbye, ${1}"}, {"hello, (?P.+)", "goodbye, $noun!", "hello, world", "goodbye, $noun!"}, {"hello, (?P.+)", "goodbye, ${noun}", "hello, world", "goodbye, ${noun}"}, {"(?Phi)|(?Pbye)", "$x$x$x", "hi", "$x$x$x"}, {"(?Phi)|(?Pbye)", "$x$x$x", "bye", "$x$x$x"}, {"(?Phi)|(?Pbye)", "$xyz", "hi", "$xyz"}, {"(?Phi)|(?Pbye)", "${x}yz", "hi", "${x}yz"}, {"(?Phi)|(?Pbye)", "hello $$x", "hi", "hello $$x"}, {"a+", "${oops", "aaa", "${oops"}, {"a+", "$$", "aaa", "$$"}, {"a+", "$", "aaa", "$"}, } type ReplaceFuncTest struct { pattern string replacement func(string) string input, output string } var replaceFuncTests = []ReplaceFuncTest{ {"[a-c]", func(s string) string { return "x" + s + "y" }, "defabcdef", "defxayxbyxcydef"}, {"[a-c]+", func(s string) string { return "x" + s + "y" }, "defabcdef", "defxabcydef"}, {"[a-c]*", func(s string) string { return "x" + s + "y" }, "defabcdef", "xydxyexyfxabcydxyexyfxy"}, } func TestReplaceAll(t *testing.T) { for _, tc := range replaceTests { re, err := Compile(tc.pattern) if err != nil { t.Errorf("Unexpected error compiling %q: %v", tc.pattern, err) continue } actual := re.ReplaceAllString(tc.input, tc.replacement) if actual != tc.output { t.Errorf("%q.ReplaceAllString(%q,%q) = %q; want %q", tc.pattern, tc.input, tc.replacement, actual, tc.output) } // now try bytes actual = string(re.ReplaceAll([]byte(tc.input), []byte(tc.replacement))) if actual != tc.output { t.Errorf("%q.ReplaceAll(%q,%q) = %q; want %q", tc.pattern, tc.input, tc.replacement, actual, tc.output) } } } func TestReplaceAllLiteral(t *testing.T) { // Run ReplaceAll tests that do not have $ expansions. for _, tc := range replaceTests { if strings.Contains(tc.replacement, "$") { continue } re, err := Compile(tc.pattern) if err != nil { t.Errorf("Unexpected error compiling %q: %v", tc.pattern, err) continue } actual := re.ReplaceAllLiteralString(tc.input, tc.replacement) if actual != tc.output { t.Errorf("%q.ReplaceAllLiteralString(%q,%q) = %q; want %q", tc.pattern, tc.input, tc.replacement, actual, tc.output) } // now try bytes actual = string(re.ReplaceAllLiteral([]byte(tc.input), []byte(tc.replacement))) if actual != tc.output { t.Errorf("%q.ReplaceAllLiteral(%q,%q) = %q; want %q", tc.pattern, tc.input, tc.replacement, actual, tc.output) } } // Run literal-specific tests. for _, tc := range replaceLiteralTests { re, err := Compile(tc.pattern) if err != nil { t.Errorf("Unexpected error compiling %q: %v", tc.pattern, err) continue } actual := re.ReplaceAllLiteralString(tc.input, tc.replacement) if actual != tc.output { t.Errorf("%q.ReplaceAllLiteralString(%q,%q) = %q; want %q", tc.pattern, tc.input, tc.replacement, actual, tc.output) } // now try bytes actual = string(re.ReplaceAllLiteral([]byte(tc.input), []byte(tc.replacement))) if actual != tc.output { t.Errorf("%q.ReplaceAllLiteral(%q,%q) = %q; want %q", tc.pattern, tc.input, tc.replacement, actual, tc.output) } } } func TestReplaceAllFunc(t *testing.T) { for _, tc := range replaceFuncTests { re, err := Compile(tc.pattern) if err != nil { t.Errorf("Unexpected error compiling %q: %v", tc.pattern, err) continue } actual := re.ReplaceAllStringFunc(tc.input, tc.replacement) if actual != tc.output { t.Errorf("%q.ReplaceFunc(%q,fn) = %q; want %q", tc.pattern, tc.input, actual, tc.output) } // now try bytes actual = string(re.ReplaceAllFunc([]byte(tc.input), func(s []byte) []byte { return []byte(tc.replacement(string(s))) })) if actual != tc.output { t.Errorf("%q.ReplaceFunc(%q,fn) = %q; want %q", tc.pattern, tc.input, actual, tc.output) } } } type MetaTest struct { pattern, output, literal string isLiteral bool } var metaTests = []MetaTest{ {``, ``, ``, true}, {`foo`, `foo`, `foo`, true}, {`日本語+`, `日本語\+`, `日本語`, false}, {`foo\.\$`, `foo\\\.\\\$`, `foo.$`, true}, // has meta but no operator {`foo.\$`, `foo\.\\\$`, `foo`, false}, // has escaped operators and real operators {`!@#$%^&*()_+-=[{]}\|,<.>/?~`, `!@#\$%\^&\*\(\)_\+-=\[\{\]\}\\\|,<\.>/\?~`, `!@#`, false}, } var literalPrefixTests = []MetaTest{ // See golang.org/issue/11175. // output is unused. {`^0^0$`, ``, `0`, false}, {`^0^`, ``, ``, false}, {`^0$`, ``, `0`, true}, {`$0^`, ``, ``, false}, {`$0$`, ``, ``, false}, {`^^0$$`, ``, ``, false}, {`^$^$`, ``, ``, false}, {`$$0^^`, ``, ``, false}, {`a\x{fffd}b`, ``, `a`, false}, {`\x{fffd}b`, ``, ``, false}, {"\ufffd", ``, ``, false}, } func TestQuoteMeta(t *testing.T) { for _, tc := range metaTests { // Verify that QuoteMeta returns the expected string. quoted := QuoteMeta(tc.pattern) if quoted != tc.output { t.Errorf("QuoteMeta(`%s`) = `%s`; want `%s`", tc.pattern, quoted, tc.output) continue } // Verify that the quoted string is in fact treated as expected // by Compile -- i.e. that it matches the original, unquoted string. if tc.pattern != "" { re, err := Compile(quoted) if err != nil { t.Errorf("Unexpected error compiling QuoteMeta(`%s`): %v", tc.pattern, err) continue } src := "abc" + tc.pattern + "def" repl := "xyz" replaced := re.ReplaceAllString(src, repl) expected := "abcxyzdef" if replaced != expected { t.Errorf("QuoteMeta(`%s`).Replace(`%s`,`%s`) = `%s`; want `%s`", tc.pattern, src, repl, replaced, expected) } } } } func TestLiteralPrefix(t *testing.T) { for _, tc := range append(metaTests, literalPrefixTests...) { // Literal method needs to scan the pattern. re := MustCompile(tc.pattern) str, complete := re.LiteralPrefix() if complete != tc.isLiteral { t.Errorf("LiteralPrefix(`%s`) = %t; want %t", tc.pattern, complete, tc.isLiteral) } if str != tc.literal { t.Errorf("LiteralPrefix(`%s`) = `%s`; want `%s`", tc.pattern, str, tc.literal) } } } type subexpIndex struct { name string index int } type subexpCase struct { input string num int names []string indices []subexpIndex } var emptySubexpIndices = []subexpIndex{{"", -1}, {"missing", -1}} var subexpCases = []subexpCase{ {``, 0, nil, emptySubexpIndices}, {`.*`, 0, nil, emptySubexpIndices}, {`abba`, 0, nil, emptySubexpIndices}, {`ab(b)a`, 1, []string{"", ""}, emptySubexpIndices}, {`ab(.*)a`, 1, []string{"", ""}, emptySubexpIndices}, {`(.*)ab(.*)a`, 2, []string{"", "", ""}, emptySubexpIndices}, {`(.*)(ab)(.*)a`, 3, []string{"", "", "", ""}, emptySubexpIndices}, {`(.*)((a)b)(.*)a`, 4, []string{"", "", "", "", ""}, emptySubexpIndices}, {`(.*)(\(ab)(.*)a`, 3, []string{"", "", "", ""}, emptySubexpIndices}, {`(.*)(\(a\)b)(.*)a`, 3, []string{"", "", "", ""}, emptySubexpIndices}, {`(?P.*)(?P(a)b)(?P.*)a`, 4, []string{"", "foo", "bar", "", "foo"}, []subexpIndex{{"", -1}, {"missing", -1}, {"foo", 1}, {"bar", 2}}}, } func TestSubexp(t *testing.T) { for _, c := range subexpCases { re := MustCompile(c.input) n := re.NumSubexp() if n != c.num { t.Errorf("%q: NumSubexp = %d, want %d", c.input, n, c.num) continue } names := re.SubexpNames() if len(names) != 1+n { t.Errorf("%q: len(SubexpNames) = %d, want %d", c.input, len(names), n) continue } if c.names != nil { for i := 0; i < 1+n; i++ { if names[i] != c.names[i] { t.Errorf("%q: SubexpNames[%d] = %q, want %q", c.input, i, names[i], c.names[i]) } } } for _, subexp := range c.indices { index := re.SubexpIndex(subexp.name) if index != subexp.index { t.Errorf("%q: SubexpIndex(%q) = %d, want %d", c.input, subexp.name, index, subexp.index) } } } } var splitTests = []struct { s string r string n int out []string }{ {"foo:and:bar", ":", -1, []string{"foo", "and", "bar"}}, {"foo:and:bar", ":", 1, []string{"foo:and:bar"}}, {"foo:and:bar", ":", 2, []string{"foo", "and:bar"}}, {"foo:and:bar", "foo", -1, []string{"", ":and:bar"}}, {"foo:and:bar", "bar", -1, []string{"foo:and:", ""}}, {"foo:and:bar", "baz", -1, []string{"foo:and:bar"}}, {"baabaab", "a", -1, []string{"b", "", "b", "", "b"}}, {"baabaab", "a*", -1, []string{"b", "b", "b"}}, {"baabaab", "ba*", -1, []string{"", "", "", ""}}, {"foobar", "f*b*", -1, []string{"", "o", "o", "a", "r"}}, {"foobar", "f+.*b+", -1, []string{"", "ar"}}, {"foobooboar", "o{2}", -1, []string{"f", "b", "boar"}}, {"a,b,c,d,e,f", ",", 3, []string{"a", "b", "c,d,e,f"}}, {"a,b,c,d,e,f", ",", 0, nil}, {",", ",", -1, []string{"", ""}}, {",,,", ",", -1, []string{"", "", "", ""}}, {"", ",", -1, []string{""}}, {"", ".*", -1, []string{""}}, {"", ".+", -1, []string{""}}, {"", "", -1, []string{}}, {"foobar", "", -1, []string{"f", "o", "o", "b", "a", "r"}}, {"abaabaccadaaae", "a*", 5, []string{"", "b", "b", "c", "cadaaae"}}, {":x:y:z:", ":", -1, []string{"", "x", "y", "z", ""}}, } func TestSplit(t *testing.T) { for i, test := range splitTests { re, err := Compile(test.r) if err != nil { t.Errorf("#%d: %q: compile error: %s", i, test.r, err.Error()) continue } split := re.Split(test.s, test.n) if !slices.Equal(split, test.out) { t.Errorf("#%d: %q: got %q; want %q", i, test.r, split, test.out) } if QuoteMeta(test.r) == test.r { strsplit := strings.SplitN(test.s, test.r, test.n) if !slices.Equal(split, strsplit) { t.Errorf("#%d: Split(%q, %q, %d): regexp vs strings mismatch\nregexp=%q\nstrings=%q", i, test.s, test.r, test.n, split, strsplit) } } } } // The following sequence of Match calls used to panic. See issue #12980. func TestParseAndCompile(t *testing.T) { expr := "a$" s := "a\nb" for i, tc := range []struct { reFlags syntax.Flags expMatch bool }{ {syntax.Perl | syntax.OneLine, false}, {syntax.Perl &^ syntax.OneLine, true}, } { parsed, err := syntax.Parse(expr, tc.reFlags) if err != nil { t.Fatalf("%d: parse: %v", i, err) } re, err := Compile(parsed.String()) if err != nil { t.Fatalf("%d: compile: %v", i, err) } if match := re.MatchString(s); match != tc.expMatch { t.Errorf("%d: %q.MatchString(%q)=%t; expected=%t", i, re, s, match, tc.expMatch) } } } // Check that one-pass cutoff does trigger. func TestOnePassCutoff(t *testing.T) { re, err := syntax.Parse(`^x{1,1000}y{1,1000}$`, syntax.Perl) if err != nil { t.Fatalf("parse: %v", err) } p, err := syntax.Compile(re.Simplify()) if err != nil { t.Fatalf("compile: %v", err) } if compileOnePass(p) != nil { t.Fatalf("makeOnePass succeeded; wanted nil") } } // Check that the same machine can be used with the standard matcher // and then the backtracker when there are no captures. func TestSwitchBacktrack(t *testing.T) { re := MustCompile(`a|b`) long := make([]byte, maxBacktrackVector+1) // The following sequence of Match calls used to panic. See issue #10319. re.Match(long) // triggers standard matcher re.Match(long[:1]) // triggers backtracker } func BenchmarkFind(b *testing.B) { b.StopTimer() re := MustCompile("a+b+") wantSubs := "aaabb" s := []byte("acbb" + wantSubs + "dd") b.StartTimer() b.ReportAllocs() for i := 0; i < b.N; i++ { subs := re.Find(s) if string(subs) != wantSubs { b.Fatalf("Find(%q) = %q; want %q", s, subs, wantSubs) } } } func BenchmarkFindAllNoMatches(b *testing.B) { re := MustCompile("a+b+") s := []byte("acddee") b.ReportAllocs() b.ResetTimer() for i := 0; i < b.N; i++ { all := re.FindAll(s, -1) if all != nil { b.Fatalf("FindAll(%q) = %q; want nil", s, all) } } } func BenchmarkFindString(b *testing.B) { b.StopTimer() re := MustCompile("a+b+") wantSubs := "aaabb" s := "acbb" + wantSubs + "dd" b.StartTimer() b.ReportAllocs() for i := 0; i < b.N; i++ { subs := re.FindString(s) if subs != wantSubs { b.Fatalf("FindString(%q) = %q; want %q", s, subs, wantSubs) } } } func BenchmarkFindSubmatch(b *testing.B) { b.StopTimer() re := MustCompile("a(a+b+)b") wantSubs := "aaabb" s := []byte("acbb" + wantSubs + "dd") b.StartTimer() b.ReportAllocs() for i := 0; i < b.N; i++ { subs := re.FindSubmatch(s) if string(subs[0]) != wantSubs { b.Fatalf("FindSubmatch(%q)[0] = %q; want %q", s, subs[0], wantSubs) } if string(subs[1]) != "aab" { b.Fatalf("FindSubmatch(%q)[1] = %q; want %q", s, subs[1], "aab") } } } func BenchmarkFindStringSubmatch(b *testing.B) { b.StopTimer() re := MustCompile("a(a+b+)b") wantSubs := "aaabb" s := "acbb" + wantSubs + "dd" b.StartTimer() b.ReportAllocs() for i := 0; i < b.N; i++ { subs := re.FindStringSubmatch(s) if subs[0] != wantSubs { b.Fatalf("FindStringSubmatch(%q)[0] = %q; want %q", s, subs[0], wantSubs) } if subs[1] != "aab" { b.Fatalf("FindStringSubmatch(%q)[1] = %q; want %q", s, subs[1], "aab") } } } func BenchmarkLiteral(b *testing.B) { x := strings.Repeat("x", 50) + "y" b.StopTimer() re := MustCompile("y") b.StartTimer() for i := 0; i < b.N; i++ { if !re.MatchString(x) { b.Fatalf("no match!") } } } func BenchmarkNotLiteral(b *testing.B) { x := strings.Repeat("x", 50) + "y" b.StopTimer() re := MustCompile(".y") b.StartTimer() for i := 0; i < b.N; i++ { if !re.MatchString(x) { b.Fatalf("no match!") } } } func BenchmarkMatchClass(b *testing.B) { b.StopTimer() x := strings.Repeat("xxxx", 20) + "w" re := MustCompile("[abcdw]") b.StartTimer() for i := 0; i < b.N; i++ { if !re.MatchString(x) { b.Fatalf("no match!") } } } func BenchmarkMatchClass_InRange(b *testing.B) { b.StopTimer() // 'b' is between 'a' and 'c', so the charclass // range checking is no help here. x := strings.Repeat("bbbb", 20) + "c" re := MustCompile("[ac]") b.StartTimer() for i := 0; i < b.N; i++ { if !re.MatchString(x) { b.Fatalf("no match!") } } } func BenchmarkReplaceAll(b *testing.B) { x := "abcdefghijklmnopqrstuvwxyz" b.StopTimer() re := MustCompile("[cjrw]") b.StartTimer() for i := 0; i < b.N; i++ { re.ReplaceAllString(x, "") } } func BenchmarkAnchoredLiteralShortNonMatch(b *testing.B) { b.StopTimer() x := []byte("abcdefghijklmnopqrstuvwxyz") re := MustCompile("^zbc(d|e)") b.StartTimer() for i := 0; i < b.N; i++ { re.Match(x) } } func BenchmarkAnchoredLiteralLongNonMatch(b *testing.B) { b.StopTimer() x := []byte("abcdefghijklmnopqrstuvwxyz") for i := 0; i < 15; i++ { x = append(x, x...) } re := MustCompile("^zbc(d|e)") b.StartTimer() for i := 0; i < b.N; i++ { re.Match(x) } } func BenchmarkAnchoredShortMatch(b *testing.B) { b.StopTimer() x := []byte("abcdefghijklmnopqrstuvwxyz") re := MustCompile("^.bc(d|e)") b.StartTimer() for i := 0; i < b.N; i++ { re.Match(x) } } func BenchmarkAnchoredLongMatch(b *testing.B) { b.StopTimer() x := []byte("abcdefghijklmnopqrstuvwxyz") for i := 0; i < 15; i++ { x = append(x, x...) } re := MustCompile("^.bc(d|e)") b.StartTimer() for i := 0; i < b.N; i++ { re.Match(x) } } func BenchmarkOnePassShortA(b *testing.B) { b.StopTimer() x := []byte("abcddddddeeeededd") re := MustCompile("^.bc(d|e)*$") b.StartTimer() for i := 0; i < b.N; i++ { re.Match(x) } } func BenchmarkNotOnePassShortA(b *testing.B) { b.StopTimer() x := []byte("abcddddddeeeededd") re := MustCompile(".bc(d|e)*$") b.StartTimer() for i := 0; i < b.N; i++ { re.Match(x) } } func BenchmarkOnePassShortB(b *testing.B) { b.StopTimer() x := []byte("abcddddddeeeededd") re := MustCompile("^.bc(?:d|e)*$") b.StartTimer() for i := 0; i < b.N; i++ { re.Match(x) } } func BenchmarkNotOnePassShortB(b *testing.B) { b.StopTimer() x := []byte("abcddddddeeeededd") re := MustCompile(".bc(?:d|e)*$") b.StartTimer() for i := 0; i < b.N; i++ { re.Match(x) } } func BenchmarkOnePassLongPrefix(b *testing.B) { b.StopTimer() x := []byte("abcdefghijklmnopqrstuvwxyz") re := MustCompile("^abcdefghijklmnopqrstuvwxyz.*$") b.StartTimer() for i := 0; i < b.N; i++ { re.Match(x) } } func BenchmarkOnePassLongNotPrefix(b *testing.B) { b.StopTimer() x := []byte("abcdefghijklmnopqrstuvwxyz") re := MustCompile("^.bcdefghijklmnopqrstuvwxyz.*$") b.StartTimer() for i := 0; i < b.N; i++ { re.Match(x) } } func BenchmarkMatchParallelShared(b *testing.B) { x := []byte("this is a long line that contains foo bar baz") re := MustCompile("foo (ba+r)? baz") b.ResetTimer() b.RunParallel(func(pb *testing.PB) { for pb.Next() { re.Match(x) } }) } func BenchmarkMatchParallelCopied(b *testing.B) { x := []byte("this is a long line that contains foo bar baz") re := MustCompile("foo (ba+r)? baz") b.ResetTimer() b.RunParallel(func(pb *testing.PB) { re := re.Copy() for pb.Next() { re.Match(x) } }) } var sink string func BenchmarkQuoteMetaAll(b *testing.B) { specials := make([]byte, 0) for i := byte(0); i < utf8.RuneSelf; i++ { if special(i) { specials = append(specials, i) } } s := string(specials) b.SetBytes(int64(len(s))) b.ResetTimer() for i := 0; i < b.N; i++ { sink = QuoteMeta(s) } } func BenchmarkQuoteMetaNone(b *testing.B) { s := "abcdefghijklmnopqrstuvwxyz" b.SetBytes(int64(len(s))) b.ResetTimer() for i := 0; i < b.N; i++ { sink = QuoteMeta(s) } } var compileBenchData = []struct{ name, re string }{ {"Onepass", `^a.[l-nA-Cg-j]?e$`}, {"Medium", `^((a|b|[d-z0-9])*(日){4,5}.)+$`}, {"Hard", strings.Repeat(`((abc)*|`, 50) + strings.Repeat(`)`, 50)}, } func BenchmarkCompile(b *testing.B) { for _, data := range compileBenchData { b.Run(data.name, func(b *testing.B) { b.ReportAllocs() for i := 0; i < b.N; i++ { if _, err := Compile(data.re); err != nil { b.Fatal(err) } } }) } } func TestDeepEqual(t *testing.T) { re1 := MustCompile("a.*b.*c.*d") re2 := MustCompile("a.*b.*c.*d") if !reflect.DeepEqual(re1, re2) { // has always been true, since Go 1. t.Errorf("DeepEqual(re1, re2) = false, want true") } re1.MatchString("abcdefghijklmn") if !reflect.DeepEqual(re1, re2) { t.Errorf("DeepEqual(re1, re2) = false, want true") } re2.MatchString("abcdefghijklmn") if !reflect.DeepEqual(re1, re2) { t.Errorf("DeepEqual(re1, re2) = false, want true") } re2.MatchString(strings.Repeat("abcdefghijklmn", 100)) if !reflect.DeepEqual(re1, re2) { t.Errorf("DeepEqual(re1, re2) = false, want true") } } var minInputLenTests = []struct { Regexp string min int }{ {``, 0}, {`a`, 1}, {`aa`, 2}, {`(aa)a`, 3}, {`(?:aa)a`, 3}, {`a?a`, 1}, {`(aaa)|(aa)`, 2}, {`(aa)+a`, 3}, {`(aa)*a`, 1}, {`(aa){3,5}`, 6}, {`[a-z]`, 1}, {`日`, 3}, } func TestMinInputLen(t *testing.T) { for _, tt := range minInputLenTests { re, _ := syntax.Parse(tt.Regexp, syntax.Perl) m := minInputLen(re) if m != tt.min { t.Errorf("regexp %#q has minInputLen %d, should be %d", tt.Regexp, m, tt.min) } } } func TestUnmarshalText(t *testing.T) { unmarshaled := new(Regexp) for i := range goodRe { re := compileTest(t, goodRe[i], "") marshaled, err := re.MarshalText() if err != nil { t.Errorf("regexp %#q failed to marshal: %s", re, err) continue } if err := unmarshaled.UnmarshalText(marshaled); err != nil { t.Errorf("regexp %#q failed to unmarshal: %s", re, err) continue } if unmarshaled.String() != goodRe[i] { t.Errorf("UnmarshalText returned unexpected value: %s", unmarshaled.String()) } } t.Run("invalid pattern", func(t *testing.T) { re := new(Regexp) err := re.UnmarshalText([]byte(`\`)) if err == nil { t.Error("unexpected success") } }) }