ElasticFileSystem' must match pattern ^(fs-)([a-z0-9]{8})$ cloudformation error

[anandktx]

If you are encountering a cloud formation error asking for ElasticFileSystem match pattern then the following can be done to Fix. In aws-refarch-wordpress-04-web.yaml line no 135, the AllowedPattern should be changed from ^(fs-)([a-z0-9]{8})$ to ^(fs-)([a-z0-9]{17})$