terraform/website/docs/language/functions/substr.mdx

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---
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page_title: substr - Functions - Configuration Language
description: |-
The substr function extracts a substring from a given string by offset and
length.
---
# `substr` Function
`substr` extracts a substring from a given string by offset and length.
```hcl
substr(string, offset, length)
```
## Examples
```
> substr("hello world", 1, 4)
ello
```
The offset and length are both counted in _unicode characters_ rather than
bytes:
```
> substr("🤔🤷", 0, 1)
🤔
```
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The offset index may be negative, in which case it is relative to the end of
the given string. The length may be -1, in which case the remainder of the
string after the given offset will be returned.
```
> substr("hello world", -5, -1)
world
```