c_gtk_source_search_context_replace

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.
__gshared extern (C)
int function(GtkSourceSearchContext* search, GtkTextIter* matchStart, GtkTextIter* matchEnd, const(char)* replace, int replaceLength, GError** err) c_gtk_source_search_context_replace;

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