Check all IDs match a given regex (#2)

.golangci.yml

@@ -49,3 +49,6 @@ issues:
     - linters:
       - gocritic
       path: spdx.go
+    - linters:
+      - gocritic
+      path: spdx_test.go

README.md

@@ -30,6 +30,8 @@ for _, license := range spdx.AllLicenses() {
 }
 ```
 
+All IDs are guaranteed to match the regular expression `^[a-zA-Z0-9-.+]+$`.
+
 ## Status: Beta
 
 This repository is still in beta, however will be promoted to stable very soon.

spdx_test.go

@@ -16,6 +16,7 @@ package spdx
 
 import (
 	"reflect"
+	"regexp"
 	"testing"
 )
 
@@ -42,3 +43,17 @@ func TestLicenseForID(t *testing.T) {
 		t.Fatal("failed to get expected license info")
 	}
 }
+
+func TestIDsMatchExpectedRegext(t *testing.T) {
+	t.Parallel()
+
+	regexp, err := regexp.Compile("^[a-zA-Z0-9-.+]+$")
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+	for _, license := range lowercaseIDToLicense {
+		if !regexp.Match([]byte(license.ID)) {
+			t.Fatalf("license ID %q did not match regex", license.ID)
+		}
+	}
+}