code: function sc_pregexpReplace(re, s1, s2) {
     var reg;
     var jss1 = sc_string2jsstring(s1);
     var jss2 = sc_string2jsstring(s2);
  
     if (re instanceof RegExp) {
         if (re.global)
  	   reg = re;
         else
  	   reg = new RegExp(re.source);
     } else {
         reg = new RegExp(sc_string2jsstring(re));
     }
  
     return jss1.replace(reg, jss2);
  }
docs: * META ((export #t))