---
title: "context_parse"
date: 0001-01-01
summary: "context_parse #  Description #  context_parse filter is used to extract fields from context variables and store them in the context。
Configuration Example #  A simple example is as follows:
flow: - name: context_parse filter: - context_parse: context: _ctx.request.path pattern: ^\/.*?\d{4}\.(?P<month>\d{2})\.(?P<day>\d{2}).*? group: "parsed_index" In above flow, the context_parse can extract fields from request：/abd-2023.02.06-abc/_search，get two new fields: parsed_index.month and parsed_index.day。
Parameter Description #     Name Type Description     context string Context variable   pattern string The regular expression used to extract the field   skip_error bool Whether to ignore the error and returned directly, such like the context variable does not exist   group string Set the group name, which the extracted fields can be placed under a separate group    "
---


# context_parse

## Description

context_parse filter is used to extract fields from context variables and store them in the context。

## Configuration Example

A simple example is as follows:

```
flow:
  - name: context_parse
    filter:
      - context_parse:
          context: _ctx.request.path
          pattern: ^\/.*?\d{4}\.(?P<month>\d{2})\.(?P<day>\d{2}).*?
          group: "parsed_index"
```

In above flow, the `context_parse` can extract fields from request：`/abd-2023.02.06-abc/_search`，get two new fields: `parsed_index.month` and `parsed_index.day`。

## Parameter Description

| Name       | Type   | Description                                                                                      |
| ---------- | ------ | ------------------------------------------------------------------------------------------------ |
| context    | string | Context variable                                                                                 |
| pattern    | string | The regular expression used to extract the field                                                 |
| skip_error | bool   | Whether to ignore the error and returned directly, such like the context variable does not exist |
| group      | string | Set the group name, which the extracted fields can be placed under a separate group              |