Repository: prometheus/prometheus (language: go)

Issue:
Case insensitive FastRegexMatcher doesn't check all folds
### What did you do?

I ran the `mimir-prometheus` [FuzzFastRegexMatcher_WithStaticallyDefinedRegularExpressions](https://github.com/grafana/mimir-prometheus/blob/6dc8786f458cefec360e12f696c4e025db749322/model/labels/regexp_test.go#L751-L751) for a while, and found a bug.

The input string `"ſſs"` is not matched by the case-insensitive regular expression `"(?i:(foo1|foo2|aaa|bbb|ccc|ddd|eee|fff|ggg|hhh|iii|lll|mmm|nnn|ooo|ppp|qqq|rrr|sss|ttt|uuu|vvv|www|xxx|yyy|zzz))",`. 

### What did you expect to see?

I expected that string to be matched, as the golang's regexp package matches it.

### What did you see instead? Under which circumstances?

It wasn't matched.


Discussion / hints:
A very quick diff that fixes the problem in the least performant way:
```diff
diff --git model/labels/regexp.go model/labels/regexp.go
index 79e340984..7681483e7 100644
--- model/labels/regexp.go
+++ model/labels/regexp.go
@@ -791,7 +791,15 @@ func (m *equalMultiStringMapMatcher) Matches(s string) bool {
        }

        _, ok := m.values[s]
-       return ok
+       if ok || m.caseSensitive {
+               return ok
+       }
+       for k := range m.values {
+               if strings.EqualFold(s, k) {
+                       return true
+               }
+       }
+       return false
 }
```
I'd also consider just going through the standard regular expression engine if the matcher is case insensitive and the string contains unicode runes.

Fix patch:
diff --git a/go.mod b/go.mod
index 8caf80727b7..ac8b4f469d0 100644
--- a/go.mod
+++ b/go.mod
@@ -77,6 +77,7 @@ require (
 	golang.org/x/oauth2 v0.21.0
 	golang.org/x/sync v0.7.0
 	golang.org/x/sys v0.21.0
+	golang.org/x/text v0.16.0
 	golang.org/x/time v0.5.0
 	golang.org/x/tools v0.22.0
 	google.golang.org/api v0.183.0
@@ -188,7 +189,6 @@ require (
 	golang.org/x/exp v0.0.0-20240119083558-1b970713d09a // indirect
 	golang.org/x/mod v0.18.0 // indirect
 	golang.org/x/term v0.21.0 // indirect
-	golang.org/x/text v0.16.0 // indirect
 	google.golang.org/genproto/googleapis/rpc v0.0.0-20240528184218-531527333157 // indirect
 	gopkg.in/inf.v0 v0.9.1 // indirect
 	gopkg.in/ini.v1 v1.67.0 // indirect
diff --git a/model/labels/regexp.go b/model/labels/regexp.go
index f228d7ff1f3..1f3f15eb07b 100644
--- a/model/labels/regexp.go
+++ b/model/labels/regexp.go
@@ -16,10 +16,12 @@ package labels
 import (
 	"slices"
 	"strings"
+	"unicode"
 	"unicode/utf8"
 
 	"github.com/grafana/regexp"
 	"github.com/grafana/regexp/syntax"
+	"golang.org/x/text/unicode/norm"
 )
 
 const (
@@ -766,7 +768,7 @@ type equalMultiStringMapMatcher struct {
 
 func (m *equalMultiStringMapMatcher) add(s string) {
 	if !m.caseSensitive {
-		s = strings.ToLower(s)
+		s = toNormalisedLower(s)
 	}
 
 	m.values[s] = struct{}{}
@@ -786,13 +788,51 @@ func (m *equalMultiStringMapMatcher) setMatches() []string {
 
 func (m *equalMultiStringMapMatcher) Matches(s string) bool {
 	if !m.caseSensitive {
-		s = strings.ToLower(s)
+		s = toNormalisedLower(s)
 	}
 
 	_, ok := m.values[s]
 	return ok
 }
 
+// toNormalisedLower normalise the input string using "Unicode Normalization Form D" and then convert
+// it to lower case.
+func toNormalisedLower(s string) string {
+	// Check if the string is all ASCII chars and convert any upper case character to lower case character.
+	isASCII := true
+	var (
+		b   strings.Builder
+		pos int
+	)
+	b.Grow(len(s))
+	for i := 0; i < len(s); i++ {
+		c := s[i]
+		if isASCII && c >= utf8.RuneSelf {
+			isASCII = false
+			break
+		}
+		if 'A' <= c && c <= 'Z' {
+			c += 'a' - 'A'
+			if pos < i {
+				b.WriteString(s[pos:i])
+			}
+			b.WriteByte(c)
+			pos = i + 1
+		}
+	}
+	if pos < len(s) {
+		b.WriteString(s[pos:])
+	}
+
+	// Optimize for ASCII-only strings. In this case we don't have to do any normalization.
+	if isASCII {
+		return b.String()
+	}
+
+	// Normalise and convert to lower.
+	return strings.Map(unicode.ToLower, norm.NFKD.String(b.String()))
+}
+
 // anyStringWithoutNewlineMatcher is a stringMatcher which matches any string
 // (including an empty one) as far as it doesn't contain any newline character.
 type anyStringWithoutNewlineMatcher struct{}


Test patch:
diff --git a/model/labels/regexp_test.go b/model/labels/regexp_test.go
index 400b5721b71..c86a5cae41a 100644
--- a/model/labels/regexp_test.go
+++ b/model/labels/regexp_test.go
@@ -70,6 +70,7 @@ var (
 		"jyyfj00j0061|jyyfj00j0062|jyyfj94j0093|jyyfj99j0093|jyyfm01j0021|jyyfm02j0021|jyefj00j0192|jyefj00j0193|jyefj00j0194|jyefj00j0195|jyefj00j0196|jyefj00j0197|jyefj00j0290|jyefj00j0291|jyefj00j0292|jyefj00j0293|jyefj00j0294|jyefj00j0295|jyefj00j0296|jyefj00j0297|jyefj89j0394|jyefj90j0394|jyefj91j0394|jyefj95j0347|jyefj96j0322|jyefj96j0347|jyefj97j0322|jyefj97j0347|jyefj98j0322|jyefj98j0347|jyefj99j0320|jyefj99j0322|jyefj99j0323|jyefj99j0335|jyefj99j0336|jyefj99j0344|jyefj99j0347|jyefj99j0349|jyefj99j0351|jyeff00j0117|lyyfm01j0025|lyyfm01j0028|lyyfm01j0041|lyyfm01j0133|lyyfm01j0701|lyyfm02j0025|lyyfm02j0028|lyyfm02j0041|lyyfm02j0133|lyyfm02j0701|lyyfm03j0701|lyefj00j0775|lyefj00j0776|lyefj00j0777|lyefj00j0778|lyefj00j0779|lyefj00j0780|lyefj00j0781|lyefj00j0782|lyefj50j3807|lyefj50j3852|lyefj51j3807|lyefj51j3852|lyefj52j3807|lyefj52j3852|lyefj53j3807|lyefj53j3852|lyefj54j3807|lyefj54j3852|lyefj54j3886|lyefj55j3807|lyefj55j3852|lyefj55j3886|lyefj56j3807|lyefj56j3852|lyefj56j3886|lyefj57j3807|lyefj57j3852|lyefj57j3886|lyefj58j3807|lyefj58j3852|lyefj58j3886|lyefj59j3807|lyefj59j3852|lyefj59j3886|lyefj60j3807|lyefj60j3852|lyefj60j3886|lyefj61j3807|lyefj61j3852|lyefj61j3886|lyefj62j3807|lyefj62j3852|lyefj62j3886|lyefj63j3807|lyefj63j3852|lyefj63j3886|lyefj64j3807|lyefj64j3852|lyefj64j3886|lyefj65j3807|lyefj65j3852|lyefj65j3886|lyefj66j3807|lyefj66j3852|lyefj66j3886|lyefj67j3807|lyefj67j3852|lyefj67j3886|lyefj68j3807|lyefj68j3852|lyefj68j3886|lyefj69j3807|lyefj69j3846|lyefj69j3852|lyefj69j3886|lyefj70j3807|lyefj70j3846|lyefj70j3852|lyefj70j3886|lyefj71j3807|lyefj71j3846|lyefj71j3852|lyefj71j3886|lyefj72j3807|lyefj72j3846|lyefj72j3852|lyefj72j3886|lyefj73j3807|lyefj73j3846|lyefj73j3852|lyefj73j3886|lyefj74j3807|lyefj74j3846|lyefj74j3852|lyefj74j3886|lyefj75j3807|lyefj75j3808|lyefj75j3846|lyefj75j3852|lyefj75j3886|lyefj76j3732|lyefj76j3807|lyefj76j3808|lyefj76j3846|lyefj76j3852|lyefj76j3886|lyefj77j3732|lyefj77j3807|lyefj77j3808|lyefj77j3846|lyefj77j3852|lyefj77j3886|lyefj78j3278|lyefj78j3732|lyefj78j3807|lyefj78j3808|lyefj78j3846|lyefj78j3852|lyefj78j3886|lyefj79j3732|lyefj79j3807|lyefj79j3808|lyefj79j3846|lyefj79j3852|lyefj79j3886|lyefj80j3732|lyefj80j3807|lyefj80j3808|lyefj80j3846|lyefj80j3852|lyefj80j3886|lyefj81j3732|lyefj81j3807|lyefj81j3808|lyefj81j3846|lyefj81j3852|lyefj81j3886|lyefj82j3732|lyefj82j3807|lyefj82j3808|lyefj82j3846|lyefj82j3852|lyefj82j3886|lyefj83j3732|lyefj83j3807|lyefj83j3808|lyefj83j3846|lyefj83j3852|lyefj83j3886|lyefj84j3732|lyefj84j3807|lyefj84j3808|lyefj84j3846|lyefj84j3852|lyefj84j3886|lyefj85j3732|lyefj85j3807|lyefj85j3808|lyefj85j3846|lyefj85j3852|lyefj85j3886|lyefj86j3278|lyefj86j3732|lyefj86j3807|lyefj86j3808|lyefj86j3846|lyefj86j3852|lyefj86j3886|lyefj87j3278|lyefj87j3732|lyefj87j3807|lyefj87j3808|lyefj87j3846|lyefj87j3852|lyefj87j3886|lyefj88j3732|lyefj88j3807|lyefj88j3808|lyefj88j3846|lyefj88j3852|lyefj88j3886|lyefj89j3732|lyefj89j3807|lyefj89j3808|lyefj89j3846|lyefj89j3852|lyefj89j3886|lyefj90j3732|lyefj90j3807|lyefj90j3808|lyefj90j3846|lyefj90j3852|lyefj90j3886|lyefj91j3732|lyefj91j3807|lyefj91j3808|lyefj91j3846|lyefj91j3852|lyefj91j3886|lyefj92j3732|lyefj92j3807|lyefj92j3808|lyefj92j3846|lyefj92j3852|lyefj92j3886|lyefj93j3732|lyefj93j3807|lyefj93j3808|lyefj93j3846|lyefj93j3852|lyefj93j3885|lyefj93j3886|lyefj94j3525|lyefj94j3732|lyefj94j3807|lyefj94j3808|lyefj94j3846|lyefj94j3852|lyefj94j3885|lyefj94j3886|lyefj95j3525|lyefj95j3732|lyefj95j3807|lyefj95j3808|lyefj95j3846|lyefj95j3852|lyefj95j3886|lyefj96j3732|lyefj96j3803|lyefj96j3807|lyefj96j3808|lyefj96j3846|lyefj96j3852|lyefj96j3886|lyefj97j3333|lyefj97j3732|lyefj97j3792|lyefj97j3803|lyefj97j3807|lyefj97j3808|lyefj97j3838|lyefj97j3843|lyefj97j3846|lyefj97j3852|lyefj97j3886|lyefj98j3083|lyefj98j3333|lyefj98j3732|lyefj98j3807|lyefj98j3808|lyefj98j3838|lyefj98j3843|lyefj98j3846|lyefj98j3852|lyefj98j3873|lyefj98j3877|lyefj98j3882|lyefj98j3886|lyefj99j2984|lyefj99j3083|lyefj99j3333|lyefj99j3732|lyefj99j3807|lyefj99j3808|lyefj99j3846|lyefj99j3849|lyefj99j3852|lyefj99j3873|lyefj99j3877|lyefj99j3882|lyefj99j3884|lyefj99j3886|lyeff00j0106|lyeff00j0107|lyeff00j0108|lyeff00j0129|lyeff00j0130|lyeff00j0131|lyeff00j0132|lyeff00j0133|lyeff00j0134|lyeff00j0444|lyeff00j0445|lyeff91j0473|lyeff92j0473|lyeff92j3877|lyeff93j3877|lyeff94j0501|lyeff94j3525|lyeff94j3877|lyeff95j0501|lyeff95j3525|lyeff95j3877|lyeff96j0503|lyeff96j3877|lyeff97j3877|lyeff98j3333|lyeff98j3877|lyeff99j2984|lyeff99j3333|lyeff99j3877|mfyr9149ej|mfyr9149ek|mfyr9156ej|mfyr9156ek|mfyr9157ej|mfyr9157ek|mfyr9159ej|mfyr9159ek|mfyr9203ej|mfyr9204ej|mfyr9205ej|mfyr9206ej|mfyr9207ej|mfyr9207ek|mfyr9217ej|mfyr9217ek|mfyr9222ej|mfyr9222ek|mfyu0185ej|mfye9187ej|mfye9187ek|mfye9188ej|mfye9188ek|mfye9189ej|mfye9189ek|mfyf0185ej|oyefj87j0007|oyefj88j0007|oyefj89j0007|oyefj90j0007|oyefj91j0007|oyefj95j0001|oyefj96j0001|oyefj98j0004|oyefj99j0004|oyeff91j0004|oyeff92j0004|oyeff93j0004|oyeff94j0004|oyeff95j0004|oyeff96j0004|rklvyaxmany|ryefj93j0001|ryefj94j0001|tyyfj00a0001|tyyfj84j0005|tyyfj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 		// A long case insensitive alternation.
 		"(?i:(zQPbMkNO|NNSPdvMi|iWuuSoAl|qbvKMimS|IecrXtPa|seTckYqt|NxnyHkgB|fIDlOgKb|UhlWIygH|OtNoJxHG|cUTkFVIV|mTgFIHjr|jQkoIDtE|PPMKxRXl|AwMfwVkQ|CQyMrTQJ|BzrqxVSi|nTpcWuhF|PertdywG|ZZDgCtXN|WWdDPyyE|uVtNQsKk|BdeCHvPZ|wshRnFlH|aOUIitIp|RxZeCdXT|CFZMslCj|AVBZRDxl|IzIGCnhw|ythYuWiz|oztXVXhl|VbLkwqQx|qvaUgyVC|VawUjPWC|ecloYJuj|boCLTdSU|uPrKeAZx|hrMWLWBq|JOnUNHRM|rYnujkPq|dDEdZhIj|DRrfvugG|yEGfDxVV|YMYdJWuP|PHUQZNWM|AmKNrLis|zTxndVfn|FPsHoJnc|EIulZTua|KlAPhdzg|ScHJJCLt|NtTfMzME|eMCwuFdo|SEpJVJbR|cdhXZeCx|sAVtBwRh|kVFEVcMI|jzJrxraA|tGLHTell|NNWoeSaw|DcOKSetX|UXZAJyka|THpMphDP|rizheevl|kDCBRidd|pCZZRqyu|pSygkitl|SwZGkAaW|wILOrfNX|QkwVOerj|kHOMxPDr|EwOVycJv|AJvtzQFS|yEOjKYYB|LizIINLL|JBRSsfcG|YPiUqqNl|IsdEbvee|MjEpGcBm|OxXZVgEQ|xClXGuxa|UzRCGFEb|buJbvfvA|IPZQxRet|oFYShsMc|oBHffuHO|bzzKrcBR|KAjzrGCl|IPUsAVls|OGMUMbIU|gyDccHuR|bjlalnDd|ZLWjeMna|fdsuIlxQ|dVXtiomV|XxedTjNg|XWMHlNoA|nnyqArQX|opfkWGhb|wYtnhdYb))",
+		"(?i:(AAAAAAAAAAAAAAAAAAAAAAAA|BBBBBBBBBBBBBBBBBBBBBBBB|cccccccccccccccccccccccC|ſſſſſſſſſſſſſſſſſſſſſſſſS|SSSSSSSSSSSSSSSSSSSSSSSSſ))",
 		// A long case insensitive alternation where each entry ends with ".*".
 		"(?i:(zQPbMkNO.*|NNSPdvMi.*|iWuuSoAl.*|qbvKMimS.*|IecrXtPa.*|seTckYqt.*|NxnyHkgB.*|fIDlOgKb.*|UhlWIygH.*|OtNoJxHG.*|cUTkFVIV.*|mTgFIHjr.*|jQkoIDtE.*|PPMKxRXl.*|AwMfwVkQ.*|CQyMrTQJ.*|BzrqxVSi.*|nTpcWuhF.*|PertdywG.*|ZZDgCtXN.*|WWdDPyyE.*|uVtNQsKk.*|BdeCHvPZ.*|wshRnFlH.*|aOUIitIp.*|RxZeCdXT.*|CFZMslCj.*|AVBZRDxl.*|IzIGCnhw.*|ythYuWiz.*|oztXVXhl.*|VbLkwqQx.*|qvaUgyVC.*|VawUjPWC.*|ecloYJuj.*|boCLTdSU.*|uPrKeAZx.*|hrMWLWBq.*|JOnUNHRM.*|rYnujkPq.*|dDEdZhIj.*|DRrfvugG.*|yEGfDxVV.*|YMYdJWuP.*|PHUQZNWM.*|AmKNrLis.*|zTxndVfn.*|FPsHoJnc.*|EIulZTua.*|KlAPhdzg.*|ScHJJCLt.*|NtTfMzME.*|eMCwuFdo.*|SEpJVJbR.*|cdhXZeCx.*|sAVtBwRh.*|kVFEVcMI.*|jzJrxraA.*|tGLHTell.*|NNWoeSaw.*|DcOKSetX.*|UXZAJyka.*|THpMphDP.*|rizheevl.*|kDCBRidd.*|pCZZRqyu.*|pSygkitl.*|SwZGkAaW.*|wILOrfNX.*|QkwVOerj.*|kHOMxPDr.*|EwOVycJv.*|AJvtzQFS.*|yEOjKYYB.*|LizIINLL.*|JBRSsfcG.*|YPiUqqNl.*|IsdEbvee.*|MjEpGcBm.*|OxXZVgEQ.*|xClXGuxa.*|UzRCGFEb.*|buJbvfvA.*|IPZQxRet.*|oFYShsMc.*|oBHffuHO.*|bzzKrcBR.*|KAjzrGCl.*|IPUsAVls.*|OGMUMbIU.*|gyDccHuR.*|bjlalnDd.*|ZLWjeMna.*|fdsuIlxQ.*|dVXtiomV.*|XxedTjNg.*|XWMHlNoA.*|nnyqArQX.*|opfkWGhb.*|wYtnhdYb.*))",
 		// A long case insensitive alternation where each entry starts with ".*".
@@ -81,6 +82,7 @@ var (
 		".*foo.?",
 		".?foo.+",
 		"foo.?|bar",
+		"ſſs",
 		// Concat of literals and wildcards.
 		".*-.*-.*-.*-.*",
 		"(.+)-(.+)-(.+)-(.+)-(.+)",
@@ -91,7 +93,7 @@ var (
 		"foo", " foo bar", "bar", "buzz\nbar", "bar foo", "bfoo", "\n", "\nfoo", "foo\n", "hello foo world", "hello foo\n world", "",
 		"FOO", "Foo", "fOo", "foO", "OO", "Oo", "\nfoo\n", strings.Repeat("f", 20), "prometheus", "prometheus_api_v1", "prometheus_api_v1_foo",
 		"10.0.1.20", "10.0.2.10", "10.0.3.30", "10.0.4.40",
-		"foofoo0", "foofoo", "😀foo0",
+		"foofoo0", "foofoo", "😀foo0", "ſſs", "ſſS", "AAAAAAAAAAAAAAAAAAAAAAAA", "BBBBBBBBBBBBBBBBBBBBBBBB", "cccccccccccccccccccccccC", "ſſſſſſſſſſſſſſſſſſſſſſſſS", "SSSSSSSSSSSSSSSSSSSSSSSSſ",
 
 		// Values matching / not matching the test regexps on long alternations.
 		"zQPbMkNO", "zQPbMkNo", "jyyfj00j0061", "jyyfj00j006", "jyyfj00j00612", "NNSPdvMi", "NNSPdvMiXXX", "NNSPdvMixxx", "nnSPdvMi", "nnSPdvMiXXX",
@@ -293,6 +295,52 @@ func BenchmarkFastRegexMatcher(b *testing.B) {
 	}
 }
 
+func BenchmarkToNormalizedLower(b *testing.B) {
+	benchCase := func(l int, uppercase string, asciiOnly bool, alt int) string {
+		chars := "abcdefghijklmnopqrstuvwxyz"
+		if !asciiOnly {
+			chars = "aаbбcвdгeдfеgёhжiзjиkйlкmлnмoнpоqпrрsсtтuуvфwхxцyчzш"
+		}
+		// Swap the alphabet to make alternatives.
+		chars = chars[alt%len(chars):] + chars[:alt%len(chars)]
+
+		str := strings.Repeat(chars, l/len(chars)+1)[:l]
+		switch uppercase {
+		case "first":
+			return strings.ToUpper(str[:1]) + str[1:]
+		case "last":
+			return str[:len(str)-1] + strings.ToUpper(str[len(str)-1:])
+		case "all":
+			return strings.ToUpper(str)
+		case "none":
+			return str
+		default:
+			panic("invalid uppercase")
+		}
+	}
+
+	for _, l := range []int{10, 100, 1000, 4000} {
+		b.Run(fmt.Sprintf("length=%d", l), func(b *testing.B) {
+			for _, uppercase := range []string{"none", "first", "last", "all"} {
+				b.Run("uppercase="+uppercase, func(b *testing.B) {
+					for _, asciiOnly := range []bool{true, false} {
+						b.Run(fmt.Sprintf("ascii=%t", asciiOnly), func(b *testing.B) {
+							inputs := make([]string, 10)
+							for i := range inputs {
+								inputs[i] = benchCase(l, uppercase, asciiOnly, i)
+							}
+							b.ResetTimer()
+							for n := 0; n < b.N; n++ {
+								toNormalisedLower(inputs[n%len(inputs)])
+							}
+						})
+					}
+				})
+			}
+		})
+	}
+}
+
 func TestStringMatcherFromRegexp(t *testing.T) {
 	for _, c := range []struct {
 		pattern string
@@ -1157,3 +1205,16 @@ func visitStringMatcher(matcher StringMatcher, callback func(matcher StringMatch
 	case trueMatcher:
 	}
 }
+
+func TestToNormalisedLower(t *testing.T) {
+	testCases := map[string]string{
+		"foo":                      "foo",
+		"AAAAAAAAAAAAAAAAAAAAAAAA": "aaaaaaaaaaaaaaaaaaaaaaaa",
+		"cccccccccccccccccccccccC": "cccccccccccccccccccccccc",
+		"ſſſſſſſſſſſſſſſſſſſſſſſſS": "sssssssssssssssssssssssss",
+		"ſſAſſa": "ssassa",
+	}
+	for input, expectedOutput := range testCases {
+		require.Equal(t, expectedOutput, toNormalisedLower(input))
+	}
+}