intypes.IsAWSRegion: Support 'eusc' Regions.

Author: ewbankkit

internal/types/aws_region.go

@@ -9,5 +9,5 @@ import (
 
 // IsAWSRegion returns whether or not the specified string is a valid AWS Region.
 func IsAWSRegion(s string) bool { // nosemgrep:ci.aws-in-func-name
-	return regexache.MustCompile(`^[a-z]{2}(-[a-z]+)+-\d{1,2}$`).MatchString(s)
+	return regexache.MustCompile(`^[a-z]{2,4}(-[a-z]+)+-\d{1,2}$`).MatchString(s)
 }

internal/types/aws_region_test.go

@@ -18,6 +18,7 @@ func TestIsAWSRegion(t *testing.T) { // nosemgrep:ci.aws-in-func-name
 		{"", false},
 		{"eu-isoe-west-1", true},
 		{"mars", false},
+		{"eusc-de-east-1", true},
 	} {
 		ok := IsAWSRegion(tc.id)
 		if got, want := ok, tc.valid; got != want {