Regex.Replace(links[i],"\\?p=[\\d]{1,}\\?p","?p");
?size=30&lang=ru&first=579&start=539?size=30&lang=ru&first=579&start=501
?size=30&lang=ru&first=579&start=501
?size=30&lang=ru&first=579&start=539
Regex.Replace(links[i],"\\?size.*?size","?size");
Regex.Replace(links[i], "(?<=\\?)(.*?)(?==).*?\\1", "\1");