Is there a verb for replacing placeholder values with actual values in a template?

Is there a verb for replacing placeholder values with actual values in a template?

For example:

The verb for transforming "Hello FirstName LastName" to "Hello John Smith".


Solution 1:

One possibility is you populate the template (that's over 1000 written instances in Google Books).

Note that this use of populate is a bit "geeky", and thus likely to be restricted to software contexts. For more general contexts, it's worth noting that Google Books has nearly 9 times more instances of fill in the template.

Solution 2:

I think you can use substituted. I derive this from @deadrat's comments above - "The OP's situation seems to call for 'parameter substitution.'"

Meaning

use or add in place of/replace

Google

In your case,

The placeholders, firstName and lastName were substituted with the actual values "John" and "Smith" respectively.