char[] toLiteralString(char c)
{
  if (c=='\'')
  {
   return "\\\'"; 
  }  
  else if (c=='\\')
  {
   return "\\\\";  
  }
   else if (c=='\n')
  {
   return "\\n";  
  }
  else
  {
   return [c];  
  }    
}


char[] toLiteralChar(char c)
{
  return "\'"~toLiteralString(c)~"\'"; 
}


void main()
{
 char[] s; 
 const r=toLiteralChar('x');
 // s=parseRegexp("x((a)x(a))");
 // searchgroupstest2!("x")("axaxaaaa",["xaxa","axa","a","a"]);
  writefln(s);
}