setSearchText
Sets the text to search.
If @search_text is null or is empty, the search will be disabled. A copy of @search_text will be made, so you can safely free @search_text after a call to this function.
You may be interested to call func@utils_unescape_search_text before this function.
Parameters
searchText
the nul-terminated text to search, or null to disable the search.