40 lines
756 B
Plaintext
40 lines
756 B
Plaintext
---
|
|
page_title: substr - Functions - Configuration Language
|
|
description: |-
|
|
The substr function extracts a substring from a given string by offset and
|
|
length.
|
|
sidebar_title: substr
|
|
---
|
|
|
|
# `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)
|
|
🤔
|
|
```
|
|
|
|
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
|
|
```
|