ふたりの日記帳

key = function(a,b){
var n, s = a, len = b.length;
　if((n = s.indexOf("[" + b + "]")) == -1) return "";
　s = s.substring(n + len + 2);
　if((n = s.indexOf("[/" + b + "]")) == -1) return "";
　return s.substring(0,n);
};

key2 = function(str,re1,re2){
　var s = str.match(new RegExp(re1)) ? RegExp.rightContext : "";
　s = s.match(new RegExp(re2)) ? RegExp.leftContext : "";
　return s;
};