Revert "use-regex annotation should be applied to only one Location"

This reverts commit a8a8b5f6e9.

internal/ingress/controller/template/template.go

@@ -171,6 +171,7 @@ var (
 		"buildOpentracing":                   buildOpentracing,
 		"proxySetHeader":                     proxySetHeader,
 		"buildInfluxDB":                      buildInfluxDB,
+		"enforceRegexModifier":               enforceRegexModifier,
 		"buildCustomErrorDeps":               buildCustomErrorDeps,
 		"buildCustomErrorLocationsPerServer": buildCustomErrorLocationsPerServer,
 		"shouldLoadModSecurityModule":        shouldLoadModSecurityModule,
@@ -372,9 +373,26 @@ func needsRewrite(location *ingress.Location) bool {
 	return false
 }
 
+// enforceRegexModifier checks if the "rewrite-target" or "use-regex" annotation
+// is used on any location path within a server
+func enforceRegexModifier(input interface{}) bool {
+	locations, ok := input.([]*ingress.Location)
+	if !ok {
+		klog.Errorf("expected an '[]*ingress.Location' type but %T was returned", input)
+		return false
+	}
+
+	for _, location := range locations {
+		if needsRewrite(location) || location.Rewrite.UseRegex {
+			return true
+		}
+	}
+	return false
+}
+
 // buildLocation produces the location string, if the ingress has redirects
 // (specified through the nginx.ingress.kubernetes.io/rewrite-target annotation)
-func buildLocation(input interface{}) string {
+func buildLocation(input interface{}, enforceRegex bool) string {
 	location, ok := input.(*ingress.Location)
 	if !ok {
 		klog.Errorf("expected an '*ingress.Location' type but %T was returned", input)
@@ -382,7 +400,7 @@ func buildLocation(input interface{}) string {
 	}
 
 	path := location.Path
-	if location.Rewrite.UseRegex {
+	if enforceRegex {
 		return fmt.Sprintf(`~* "^%s"`, path)
 	}