Gets the number of characters in the text.
length also has a function of the same name that retrieves the number of array items.
How to use
It is also used to initialize or set variables of type Integer.
Clicking on length in the "Expression" tab sets the function name and () in the formula field.
Specify the text to get the number of characters by enclosing it in ' and click OK.
If you want to use dynamic content or variables, the ,delimiter is the same.
If you see something like the following, your settings are complete.
You can change the contents of the function by clicking on the purple icon.
For example, length('abc') results in 3.