gcloud compute url-maps add-path-matcher myproject-url-map --default-service
backend-service-wordpress  --path-matcher-name root --path-rules "/=backend-
service-wordpress,/features/=backend-service-wordpress,/pricing/=backend-
service-wordpress,/blog/=backend-service-wordpress,/?*=backend-service-wordpress"

ERROR: (gcloud.compute.url-maps.add-path-matcher) There was a problem modifying the resource:
 - Invalid value for field 'resource': ''. Invalid path pattern

gcloud compute url-maps add-path-matcher myproject-url-map --default-service
    backend-service-app --path-matcher-name others --path-rules "/*=backend-service-end"