# Middle

This Function returns a *\<string>*, which is a substring of the specified **Source string**, starting at the **Starting position**, with the specified Length.

### Parameters

* **Source string** *\<string> -* String from where to extract a substring.
* **Starting position** *\<string> -* Starting position in the **Source string** of the string to extract.
* **Length** *\<numeric> -* Length of the substring to extract.

### Examples

* *Example 1*

Mid("Enjoy Kalipso.", 7, 7)\
**Result** = Kalipso

* *Example 2*

Mid("Enjoy Kalipso.", 0, 5)\
**Result** = Enjoy

* *Example 3*

Mid("Enjoy Kalipso.", 15, 2)\
**Result** =

* *Example 4*

Mid("Enjoy Kalipso.", 7, 10)\
**Result** = Kalipso.

{% hint style="info" %}
If you specify a **Starting position** higher than the length of the specified **Source string**, and empty string will be returned.
{% endhint %}

{% hint style="info" %}
If you specify a Length higher than the difference between the length of the specified **Source string** and the specified **Starting position**, the returned string will be the left part of the **Source string**, starting at **Starting position**.
{% endhint %}


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://doc.sysdevmobile.com/kalipso5/developing/form/expressions/functions/functions-descriptions/string-functions/middle.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.