You're seeing just the function replace_first, go back to Liquex.Filter module for more information.
Link to this function

replace_first(value, original, replacement, _)

View Source

Replaces only the first occurrence of the first argument in a string with the second argument.


iex> Liquex.Filter.replace_first("Take my protein pills and put my helmet on", "my", "your", %{})
"Take your protein pills and put my helmet on"