Including regex version validation (#831)

README.md

@@ -189,6 +189,7 @@ Baked-in Validations
 | uuid5 | Universally Unique Identifier UUID v5 |
 | uuid5_rfc4122 | Universally Unique Identifier UUID v5 RFC4122 |
 | uuid_rfc4122 | Universally Unique Identifier UUID RFC4122 |
+| semver | Semantic Versioning 2.0.0 |
 | ulid | Universally Unique Lexicographically Sortable Identifier ULID |
 
 ### Comparisons:

baked_in.go

@@ -199,6 +199,7 @@ var (
 		"postcode_iso3166_alpha2":       isPostcodeByIso3166Alpha2,
 		"postcode_iso3166_alpha2_field": isPostcodeByIso3166Alpha2Field,
 		"bic":                           isIsoBicFormat,
+		"semver":                        isSemverFormat,
 		"dns_rfc1035_label":             isDnsRFC1035LabelFormat,
 	}
 )
@@ -2421,6 +2422,13 @@ func isIsoBicFormat(fl FieldLevel) bool {
 	return bicRegex.MatchString(bicString)
 }
 
+// isSemverFormat is the validation function for validating if the current field's value is a valid semver version, defined in Semantic Versioning 2.0.0
+func isSemverFormat(fl FieldLevel) bool {
+	semverString := fl.Field().String()
+
+	return semverRegex.MatchString(semverString)
+}
+
 // isDnsRFC1035LabelFormat is the validation function
 // for validating if the current field's value is
 // a valid dns RFC 1035 label, defined in RFC 1035.

doc.go

@@ -1276,6 +1276,12 @@ More information on https://golang.org/pkg/time/#LoadLocation
 
 	Usage: timezone
 
+Semantic Version
+
+This validates that a string value is a valid semver version, defined in Semantic Versioning 2.0.0.
+More information on https://semver.org/
+
+	Usage: semver
 
 Alias Validators and Tags
 

regexes.go

@@ -52,6 +52,7 @@ const (
 	jWTRegexString                   = "^[A-Za-z0-9-_]+\\.[A-Za-z0-9-_]+\\.[A-Za-z0-9-_]*$"
 	splitParamsRegexString           = `'[^']*'|\S+`
 	bicRegexString                   = `^[A-Za-z]{6}[A-Za-z0-9]{2}([A-Za-z0-9]{3})?$`
+	semverRegexString                = `^(0|[1-9]\d*)\.(0|[1-9]\d*)\.(0|[1-9]\d*)(?:-((?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*)(?:\.(?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*))*))?(?:\+([0-9a-zA-Z-]+(?:\.[0-9a-zA-Z-]+)*))?$` // numbered capture groups https://semver.org/
 	dnsRegexStringRFC1035Label       = "^[a-z]([-a-z0-9]*[a-z0-9]){0,62}$"
 )
 
@@ -105,5 +106,6 @@ var (
 	jWTRegex                   = regexp.MustCompile(jWTRegexString)
 	splitParamsRegex           = regexp.MustCompile(splitParamsRegexString)
 	bicRegex                   = regexp.MustCompile(bicRegexString)
+	semverRegex                = regexp.MustCompile(semverRegexString)
 	dnsRegexRFC1035Label       = regexp.MustCompile(dnsRegexStringRFC1035Label)
 )

validator_test.go

@@ -11383,6 +11383,84 @@ func TestBicIsoFormatValidation(t *testing.T) {
 	}
 }
 
+func TestSemverFormatValidation(t *testing.T) {
+	tests := []struct {
+		value    string `validate:"semver"`
+		tag      string
+		expected bool
+	}{
+		{"1.2.3", "semver", true},
+		{"10.20.30", "semver", true},
+		{"1.1.2-prerelease+meta", "semver", true},
+		{"1.1.2+meta", "semver", true},
+		{"1.1.2+meta-valid", "semver", true},
+		{"1.0.0-alpha", "semver", true},
+		{"1.0.0-alpha.1", "semver", true},
+		{"1.0.0-alpha.beta", "semver", true},
+		{"1.0.0-alpha.beta.1", "semver", true},
+		{"1.0.0-alpha0.valid", "semver", true},
+		{"1.0.0-alpha.0valid", "semver", true},
+		{"1.0.0-alpha-a.b-c-somethinglong+build.1-aef.1-its-okay", "semver", true},
+		{"1.0.0-rc.1+build.1", "semver", true},
+		{"1.0.0-rc.1+build.123", "semver", true},
+		{"1.2.3-beta", "semver", true},
+		{"1.2.3-DEV-SNAPSHOT", "semver", true},
+		{"1.2.3-SNAPSHOT-123", "semver", true},
+		{"2.0.0+build.1848", "semver", true},
+		{"2.0.1-alpha.1227", "semver", true},
+		{"1.0.0-alpha+beta", "semver", true},
+		{"1.2.3----RC-SNAPSHOT.12.9.1--.12+788", "semver", true},
+		{"1.2.3----R-S.12.9.1--.12+meta", "semver", true},
+		{"1.2.3----RC-SNAPSHOT.12.9.1--.12", "semver", true},
+		{"1.0.0+0.build.1-rc.10000aaa-kk-0.1", "semver", true},
+		{"99999999999999999999999.999999999999999999.99999999999999999", "semver", true},
+		{"1.0.0-0A.is.legal", "semver", true},
+		{"1", "semver", false},
+		{"1.2", "semver", false},
+		{"1.2.3-0123", "semver", false},
+		{"1.2.3-0123.0123", "semver", false},
+		{"1.1.2+.123", "semver", false},
+		{"+invalid", "semver", false},
+		{"-invalid", "semver", false},
+		{"-invalid+invalid", "semver", false},
+		{"alpha", "semver", false},
+		{"alpha.beta.1", "semver", false},
+		{"alpha.1", "semver", false},
+		{"1.0.0-alpha_beta", "semver", false},
+		{"1.0.0-alpha_beta", "semver", false},
+		{"1.0.0-alpha...1", "semver", false},
+		{"01.1.1", "semver", false},
+		{"1.01.1", "semver", false},
+		{"1.1.01", "semver", false},
+		{"1.2", "semver", false},
+		{"1.2.Dev", "semver", false},
+		{"1.2.3.Dev", "semver", false},
+		{"1.2-SNAPSHOT", "semver", false},
+	}
+
+	validate := New()
+
+	for i, test := range tests {
+
+		errs := validate.Var(test.value, test.tag)
+
+		if test.expected {
+			if !IsEqual(errs, nil) {
+				t.Fatalf("Index: %d semver failed Error: %s", i, errs)
+			}
+		} else {
+			if IsEqual(errs, nil) {
+				t.Fatalf("Index: %d semver failed Error: %s", i, errs)
+			} else {
+				val := getError(errs, "", "")
+				if val.Tag() != "semver" {
+					t.Fatalf("Index: %d semver failed Error: %s", i, errs)
+				}
+			}
+		}
+	}
+}
+  
 func TestRFC1035LabelFormatValidation(t *testing.T) {
 	tests := []struct {
 		value    string `validate:"dns_rfc1035_label"`