---
title: File Name Pattern (Model Object)
description: File Name Pattern (FileNamePattern) is the regular expression that selects the files the Stage loader copies from the Snowflake stage folder of a Source.
---

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# File Name Pattern (Model Object)

**Applies to**  
Platform: Snowflake  
Architecture: Stage

File Name Pattern (`FileNamePattern`) is the regular expression that selects the files the Stage loader copies from the Snowflake stage folder of a Source. Partition Order (`PartitionOrder`) marks the terms of a Source whose values come from partition folders in the file path.

Both properties exist only in the Snowflake Stage File generator.

### Where to set them

- File Name Pattern: when you [edit a model object](https://knowledge.bigenius-x.com/edit-a-model-object?hsLang=en) of type Source. It is a text field.
- Partition Order: in the Edit Term dialog of a term of a Source. A Discovery of partitioned files sets it, for example `1`, `2` and `3` for the folders `year`, `month` and `day`.

### Values and defaults

- File Name Pattern: a regular expression in the syntax of the `PATTERN` option of Snowflake [COPY INTO](https://docs.snowflake.com/en/sql-reference/sql/copy-into-table). Default `.*[.]parquet`, which selects every file with the extension `.parquet`.
- Partition Order: a number for the level of the partition folder. Default empty, which means that the term is read from the file content.

### Effect on the Stage loader

The Stage loader copies the files with `COPY INTO`. It reads the folder `<source object name>/` of the Snowflake stage that the source system placeholders `snowflake_stage_database_name`, `snowflake_stage_schema_name` and `snowflake_stage_name` name, and passes File Name Pattern as `PATTERN`. For each term with a Partition Order, it takes the value from the folder `<term name>=<value>` of the file path.

### Example

The Source `customer` reads Parquet files stored in folders such as `customer/dt=2024-06-30/`. Its term `dt` has Partition Order `1`, and File Name Pattern keeps its default. The Stage loader contains:

```
,SPLIT_PART(SPLIT_PART(METADATA$FILENAME, '/dt=', 2), '/', 1)::DATE
    AS DT
...
PATTERN = '.*[.]parquet'
```

With File Name Pattern `.*part-0.*[.]parquet` on a Source, the `COPY INTO` statement of its Stage ends with `PATTERN = '.*part-0.*[.]parquet'`. Snowflake applies the pattern as described in its `COPY INTO` documentation.

### Related articles

- See also: [Snowflake - Stage Files](https://knowledge.bigenius-x.com/snowflake-stage-files?hsLang=en), [Edit a Model Object](https://knowledge.bigenius-x.com/edit-a-model-object?hsLang=en)

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