[jira] [Commented] (MIME4J-263) DecoderUtil.decodeEncodedWords() doesn't decode an encoded empty string

["Artur Jablonski (JIRA)" <mi...@james.apache.org>]

    [ https://issues.apache.org/jira/browse/MIME4J-263?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16131971#comment-16131971 ] 

Artur Jablonski commented on MIME4J-263:
----------------------------------------

I've seen there's a comment in unit tests that the rfc2047 requires at least one character... still. I'd say it makes sense to decode such strings to empty string. 


> DecoderUtil.decodeEncodedWords() doesn't decode an encoded empty string
> -----------------------------------------------------------------------
>
>                 Key: MIME4J-263
>                 URL: https://issues.apache.org/jira/browse/MIME4J-263
>             Project: James Mime4j
>          Issue Type: Bug
>          Components: parser (core)
>            Reporter: Artur Jablonski
>            Priority: Minor
>
> {{DecoderUtil.decodeEncodedWords()}} returns an unencoded string if the word to decode is empty.
> For example
> {{DecoderUtil.decodeEncodedWords("=?utf-8?Q??=", DecodeMonitor.SILENT)}}
> returns
> {{"=?utf-8?Q??="}}
> instead of empty string (or perhaps null)
> The problem lies in the regexp that is used behind the scenes that requires at least one character:
> {code}
> private static final Pattern PATTERN_ENCODED_WORD = Pattern.compile(
>             "(.*?)=\\?(.+?)\\?(\\w)\\?(.+?)\\?=", Pattern.DOTALL);
> {code}



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