| --- |
| page_title: upper - Functions - Configuration Language |
| description: >- |
| The upper function converts all cased letters in the given string to |
| uppercase. |
| --- |
| |
| # `upper` Function |
| |
| `upper` converts all cased letters in the given string to uppercase. |
| |
| ## Examples |
| |
| ``` |
| > upper("hello") |
| HELLO |
| > upper("алло!") |
| АЛЛО! |
| ``` |
| |
| This function uses Unicode's definition of letters and of upper- and lowercase. |
| |
| ## Related Functions |
| |
| * [`lower`](/language/functions/lower) converts letters in a string to _lowercase_. |
| * [`title`](/language/functions/title) converts the first letter of each word in a string to uppercase. |
