Currently, it is not possible to search for a string in the log file sub-window.
I think this will be useful to be able to find specific information about LaTeX configuration and errors.
For example, to find the version of a package, one will only have to search for the package name (currently, I have to look for it by hand)
Anonymous
Workaround: You can already right-click and select+copy the text. Then paste in a new editor window. Not elegant, but better than manual search.