Parser: handle tagged responses without response code and/or other text

lib/Parser.js

@@ -18,7 +18,7 @@ var CH_LF = 10,
     RE_LISTCONTENT = /^\((.*)\)$/,
     RE_LITERAL = /\{(\d+)\}$/,
     RE_UNTAGGED = /^\* (?:(OK|NO|BAD|BYE|FLAGS|ID|LIST|XLIST|LSUB|SEARCH|STATUS|CAPABILITY|NAMESPACE|PREAUTH|SORT|THREAD|ESEARCH|QUOTA|QUOTAROOT)|(\d+) (EXPUNGE|FETCH|RECENT|EXISTS))(?:(?: \[([^\]]+)\])?(?: (.+))?)?$/i,
-    RE_TAGGED = /^A(\d+) (OK|NO|BAD) (?:\[([^\]]+)\] )?(.+)$/i,
+    RE_TAGGED = /^A(\d+) (OK|NO|BAD) ?(?:\[([^\]]+)\] )?(.*)$/i,
     RE_CONTINUE = /^\+(?: (?:\[([^\]]+)\] )?(.+))?$/i,
     RE_CRLF = /\r\n/g,
     RE_HDR = /^([^:]+):[ \t]?(.+)?$/,

test/test-parser.js

@@ -465,6 +465,15 @@ var CR = '\r', LF = '\n', CRLF = CR + LF;
               ],
     what: 'QuotaRoot'
   },
+  { source: ['A1 OK', CRLF], // some servers like ppops.net sends such response
+    expected: [ { type: 'ok',
+                  tagnum: 1,
+                  textCode: undefined,
+                  text: ''
+                }
+              ],
+    what: 'Tagged OK (no text code, no text)'
+  },
 ].forEach(function(v) {
   var ss = new require('stream').Readable(), p, result = [];
   ss._read = function(){};