docs: function find(search, filter, strict) {
    var lang, search = search || [], i, k, v, re = /^(LC_|LANG)/;
    for(i = 0;i < search.length;i++) {
      lang = sanitize(process.env[search[i]] || '', filter);
      if(lang) return c(lang);
    }
    // nothing found in search array, find first available
    for(k in process.env) {
      v = process.env[k];
      if(re.test(k) && v) {
        lang = sanitize(v, filter);
        if(lang) break;
      }
    }
    if(!lang) lang = c(sanitize(process.env.LANG, filter));
    return c(lang) || (!strict ? language : null);
  }