Parser: support optional language in mime encoded words (RFC2231)

lib/Parser.js

@@ -20,9 +20,9 @@ var CH_LF = 10,
     RE_CONTINUE = /^\+(?: (?:\[([^\]]+)\] )?(.+))?$/i,
     RE_CRLF = /\r\n/g,
     RE_HDR = /^([^:]+):[ \t]?(.+)?$/,
-    RE_ENCWORD = /=\?([^?]*?)\?([qb])\?(.*?)\?=/gi,
-    RE_ENCWORD_END = /=\?([^?]*?)\?([qb])\?(.*?)\?=$/i,
-    RE_ENCWORD_BEGIN = /^[ \t]=\?([^?]*?)\?([qb])\?(.*?)\?=/i,
+    RE_ENCWORD = /=\?([^?*]*?)(?:\*.*?)?\?([qb])\?(.*?)\?=/gi,
+    RE_ENCWORD_END = /=\?([^?*]*?)(?:\*.*?)?\?([qb])\?(.*?)\?=$/i,
+    RE_ENCWORD_BEGIN = /^[ \t]=\?([^?*]*?)(?:\*.*?)?\?([qb])\?(.*?)\?=/i,
     RE_QENC = /(?:=([a-fA-F0-9]{2}))|_/g,
     RE_SEARCH_MODSEQ = /^(.+) \(MODSEQ (.+?)\)$/i,
     RE_LWS_ONLY = /^[ \t]*$/;

test/test-parse-header.js

@@ -20,6 +20,14 @@ var CRLF = '\r\n';
     expected: { subject: [ '¡Hola, señor!' ] },
     what: 'MIME encoded-word in value'
   },
+  { source: ['Subject: =?iso-8859-1*es?Q?=A1Hola,_se=F1or!?=', CRLF],
+    expected: { subject: [ '¡Hola, señor!' ] },
+    what: 'MIME encoded-word in value with language set (RFC2231)'
+  },
+  { source: ['Subject: =?iso-8859-1*?Q?=A1Hola,_se=F1or!?=', CRLF],
+    expected: { subject: [ '¡Hola, señor!' ] },
+    what: 'MIME encoded-word in value with empty language set'
+  },
   { source: ['Subject: =?GB2312?Q?=B2=E2=CA=D4=CC=E2=C4=BF=D3=EB=D6=D0=B9=FA=D0=C5_long_subjects_are_not_OK_12?=', CRLF,
              ' =?GB2312?Q?345678901234567890123456789012345678901234567890123456789012?=', CRLF,
              ' =?GB2312?Q?345678901234567890?=', CRLF],