> For the complete documentation index, see [llms.txt](https://help.novacuraflow.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.novacuraflow.com/development/flowscript/functions/text-functions/instr.md).

# InStr

This Flow Script tutorial explains how to use the InStr function with syntax and examples.

### **Description**‌

The InStr function returns the 0-based index of the first occurrence of the search string within input, or -1 if the substring is not found.

### **Syntax**

‌The syntax for the InStr function is:

`InStr(input, search)`

#### ‌**Parameters**

‌input - the string in which the search is done.

search - the string which searched for

### ‌**Returns**

‌The InStr function returns an integer.‌

### **Example**

Let's look at some InStr function examples and explore how to use the InStr function.‌

```
InStr("hello world", "h")
Result: 0

InStr("hello world", "e")
Result: 1

InStr("hello world", "o")
Result: 4

return InStr("hello world", " ")
Result: 5

InStr("hello world", "ell")
Result: 1

InStr("hello world", "eo")
Result: -1
```


---

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