title: special characters in replace function
body: <p>GREL replace function expects 3 strings, or a string, a regex and a string.
  In the 3rd string used for replacement, some characters have a special behavior :  \, \, \t, \n, \', \" and maybe some other combinations.
  \ does nothing, or an error
  \ is interpreted as \
  \t is interpreted as a tab character
  \n is interpreted as a new line
  \" is interpreted as "
  \' is interpreted as '</p>
  
  <p>Ex :
  "abab".replace('b',"\") -> "Parsing error at offset 19: Missing number, string, identifier, regex, or parenthesized expression"</p>
  
  <p>"abab".replace ('b',"\t") -> a  a   </p>
  
  <p>I suppose it has something to do with Java...
  Is there other special combinations?
  Is it documented somewhere on the wiki? </p>