# Trim prefix from string

## Description

This operation removes a specified prefix from the beginning of a string, if it exists.

This operation is useful for cleaning or normalizing text data by stripping a known or unwanted prefix from input strings.

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## Data types

These are the input/output expected data types for this operation:

### Input data

![](https://965373739-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FkxZeV4nlXcIAjMGZxzLI%2Fuploads%2FExtApHuiMxiHgaNWDLb2%2Fimage.png?alt=media\&token=5f4e1372-a2db-4d7e-b81b-976507cac896) - Strings to be trimmed.

### Output data

![](https://965373739-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FkxZeV4nlXcIAjMGZxzLI%2Fuploads%2FyeZGvHDhYqskHKW5bdnp%2Fimage.png?alt=media\&token=d72665aa-3d46-4572-a463-a62344ee7f88) - The resulting string after removing the specified prefix.

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## Parameters

These are the parameters you need to configure to use this operation (mandatory parameters are marked with a <mark style="color:red;">**\***</mark>):

<details>

<summary>Prefix to trim<mark style="color:red;"><strong>*</strong></mark></summary>

The prefix to remove from the beginning of the input strings. If the input string starts with this prefix, it will be removed; otherwise, the string will remain unchanged.

</details>

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## Example

Suppose you want to **trim** your input strings by removing a specific **prefix**:

1. In your Pipeline, open the required [Action](https://docs.onum.com/the-workspace/pipelines/actions) configuration and select the input **Field**.
2. In the **Operation** field, choose **Trim prefix from string**.
3. Set **Prefix to trim** to `Hello,` .
4. Give your **Output field** a name and click **Save**. The input strings will be trimmed, removing the specified prefix.

For example:

{% code overflow="wrap" %}

```
"Hello, World!" -> "World!"
```

{% endcode %}

{% hint style="info" %}
You can try out operations with specific values using the **Input** field above the operation. You can enter the value in the example above and check the result in the **Output** field.
{% endhint %}