'|' (pipe character) causes error during analyze [zentures/sequence#16]

[leolee192]

@Leftium opened zentures/sequence#16 and commented

Steps to Reproduce:

1. `echo "t=|" > input.txt`

2. `go run sequence.go analyze --input input.txt`

Expected Results:

2016/05/12 13:13:56 Analyzed 1 messages, found 1 unique patterns, 1 are new.

(No error and message is analyzed.)

Actual Results:

2016/05/12 13:13:56 Error analyzing: t=|
2016/05/12 13:13:56 Analyzed 1 messages, found 0 unique patterns, 0 are new.

Comments:
I think something is going wrong with the heuristics for key=value pairs. I found this bug while processing an actual log file. One of the log events in question:

81.181.146.13 - - [15/Mar/2005:05:06:49 -0500] "GET //cgi-bin/awstats/awstats.pl?configdir=|%20id%20| HTTP/1.1" 404 1050 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)"

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@antham referenced this issue on 21 May 2016
Handle pipe #17

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@jobordu commented

Might be related, but I found an error and it might be caused be the '|' caracter:

2017/04/18 12:13:32 Error analyzing:
2017-04-11T16:49:28.551 Something is wrong with Attachment Browser Plugin, no working directory found: QDir( "C:/SpecifX_stateFiles/V2/femoralUnWrapNoManageLink3_pv_attachments" , nameFilters = { "*" }, QDir::SortFlags( Name | IgnoreCase ) , QDir::Filters( Dirs|Files|Drives|AllEntries ) ) (:0, )

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No further details from zentures/sequence#16