Fixes https://github.com/spring-cloud/stream-applications/issues/146 The `SftpRegexPatternFileListFilter` is used for the `filenamePattern` option, too. It seems like a copy/paste artefact * Change `filenamePattern`-based configuration for the `SftpSimplePatternFileListFilter` * Fix `SftpSupplierApplicationTests` for multi-OS compatibility