Filter fields using Regular Expressions

``` glaze json misc/test-data/sample.json --input-is-array --regex-fields "^name_.*" --regex-filters ".*_last$" ```

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📄 Filter fields using Regular Expressions — glaze help regex-filters
regex-filters

Filter fields using Regular Expressions

``` glaze json misc/test-data/sample.json --input-is-array --regex-fields "^name_.*" --regex-filters ".*_last

quot; ```

Exampleregex-filtersregex-fieldsyamljsoncsvregex-fieldsregex-filters

You can use regular expressions to include or exclude fields from the output. This is useful when dealing with a large number of fields or fields with dynamic names.

The --regex-fields flag allows you to specify regex patterns for fields you want to include. The --regex-filters flag allows you to specify regex patterns for fields you want to exclude.

These flags can be combined with the standard --fields and --filter flags. The precedence rules are complex but generally, filters (both standard and regex) take precedence over includes. Exact matches (--fields, --filter) usually have higher priority than regex or prefix matches.

Let's use the following sample data (misc/test-data/sample.json):

[
  {
    "id": 1,
    "name_first": "John",
    "name_last": "Doe",
    "address_street": "123 Main St",
    "address_city": "Anytown",
    "email": "john.doe@example.com",
    "phone_home": "555-1234",
    "phone_work": "555-5678"
  },
  {
    "id": 2,
    "name_first": "Jane",
    "name_last": "Smith",
    "address_street": "456 Oak Ave",
    "address_city": "Otherville",
    "email": "jane.smith@example.com",
    "phone_home": "555-4321",
    "phone_work": "555-8765"
  }
]

Examples

1. Include fields starting with "name_"

❯ glaze json misc/test-data/sample.json --input-is-array --regex-fields "^name_.*"
+------------+-----------+
| name_first | name_last |
+------------+-----------+
| John       | Doe       |
| Jane       | Smith     |
+------------+-----------+

2. Include fields containing "address"

❯ glaze json misc/test-data/sample.json --input-is-array --regex-fields "address"
+----------------+--------------+
| address_street | address_city |
+----------------+--------------+
| 123 Main St    | Anytown      |
| 456 Oak Ave    | Otherville   |
+----------------+--------------+

3. Exclude fields ending with "_work"

❯ glaze json misc/test-data/sample.json --input-is-array --regex-filters "_work
quot;
+----+------------+-----------+----------------+--------------+------------------------+------------+
| id | name_first | name_last | address_street | address_city | email                  | phone_home |
+----+------------+-----------+----------------+--------------+------------------------+------------+
|  1 | John       | Doe       | 123 Main St    | Anytown      | john.doe@example.com   | 555-1234   |
|  2 | Jane       | Smith     | 456 Oak Ave    | Otherville   | jane.smith@example.com | 555-4321   |
+----+------------+-----------+----------------+--------------+------------------------+------------+


❯ glaze json misc/test-data/sample.json --input-is-array --regex-filters "^phone_.*"
+----+------------+-----------+----------------+--------------+------------------------+
| id | name_first | name_last | address_street | address_city | email                  |
+----+------------+-----------+----------------+--------------+------------------------+
|  1 | John       | Doe       | 123 Main St    | Anytown      | john.doe@example.com   |
|  2 | Jane       | Smith     | 456 Oak Ave    | Otherville   | jane.smith@example.com |
+----+------------+-----------+----------------+--------------+------------------------+

5. Combine Regex Fields and Filters: Include "name_" fields, exclude "_last"

❯ glaze json misc/test-data/sample.json --input-is-array --regex-fields "^name_.*" --regex-filters "_last
quot;
+------------+
| name_first |
+------------+
| John       |
| Jane       |
+------------+

6. Combine Regex and Standard Flags: Include "address" fields via regex, but specifically filter out "address_city"

❯ glaze json misc/test-data/sample.json --input-is-array --regex-fields "address" --filter address_city
+----------------+
| address_street |
+----------------+
| 123 Main St    |
| 456 Oak Ave    |
+----------------+

7. Combine Regex and Standard Flags: Include "id" specifically, and all "phone" fields via regex

❯ glaze json misc/test-data/sample.json --input-is-array --fields id --regex-fields "^phone_.*"
+----+------------+------------+
| id | phone_home | phone_work |
+----+------------+------------+
|  1 | 555-1234   | 555-5678   |
|  2 | 555-4321   | 555-8765   |
+----+------------+------------+