# Manage Identifiers

**Requirement**: Immuta permission `GOVERNANCE` or domain-specific `Manage Identifiers`

## Create an identifier

This action can be done within a domain from the **Identifiers tab** to create a domain-specific identifier, or it can be done from the **Identifiers page** to create a reference identifier.

1. Click **Create New**.
2. Enter a **name** and **description** for the new identifier.
3. Click **Next**.
4. **Enter criteria**: Select the [**Type** of criteria](https://documentation.immuta.com/saas/configuration/tags/data-discovery/..#criteria).
   1. For regex, enter a regex to be matched against column values. The default criteria encoding is case-sensitive. You can change this encoding using the regex criteria. The regex must use RE2.
   2. For a dictionary, enter the values in a comma-separated list to match against column values. Opt to toggle the **Case insensitive** switch to on if you want the dictionary to be case sensitive.
   3. For column name regex, enter a regex to be matched against column names. The default criteria encoding is case-insensitive. You can change this encoding using the regex criteria. The regex must use RE2 syntax.
5. Click **Next**.
6. **Select the tags to apply**: Use the text box to search for a tag or type a tag name to create a new tag under the "Discovered . Entity" hierarchy to apply to columns that match your identifier.
7. Click **Next** to review your new identifier and click **Create Identifier** to create it.

*Note that all user-created identifiers must be a 90% match or greater for the contents of the column to be tagged.*

## Edit an identifier

Editing the details of an identifier from the identifiers page will only affect that identifier; no copies of that identifier will be impacted.

{% tabs %}
{% tab title="Reference identifier" %}
To edit a reference identifier,

1. Click **Metadata** in the navigation menu and select **Identifiers**.
2. Click the **more actions** icon of the identifier you want to edit.
3. Select **Edit**.
4. Edit the field you want to change.
5. Click **Save**.

*Built-in identifiers cannot be edited.*
{% endtab %}

{% tab title="Domain identifier" %}
To edit a domain identifier,

1. Click **Domains** and navigate to the domain.
2. Select the **Identifiers** tab.
3. Click the **more actions** icon of the identifier you want to edit.
4. Click **Edit**.
5. Edit the field you want to change.
6. Click **Save**.
   {% endtab %}
   {% endtabs %}

## Delete an identifier

Deleting a domain identifier from the identifiers page will remove it from the domain it is in.

{% tabs %}
{% tab title="Reference identifier" %}
To delete a reference identifier,

1. Click **Metadata** in the navigation menu and select **Identifiers**.
2. Click the **more actions** icon of the identifier you want to delete.
3. Select **Delete** and click **Save**.

*Built-in identifiers cannot be deleted.*
{% endtab %}

{% tab title="Domain identifier" %}
To delete a domain identifier,

1. Click **Domains** and navigate to the domain.
2. Select the **Identifiers** tab.
3. Click the **more actions** icon of the identifier you want to delete.
4. Select **Delete** and click **Save**.
   {% endtab %}
   {% endtabs %}