Discover problem

[cmuthapp]

Hi jordan,
I have been trying to understand discover and its functionality. I was experimenting with various regular expressions and found this. Can you please explain the below behavior of grok.discover.

I included a new pattern in my pattern file called wslog
WSLOG [%{WSDATE:timestamp}]%{SPACE}%{WORD:address}%{SPACE}%{USERNAME:user}%{SPACE}%{WORD:code}%{SPACE}%{GREEDYDATA:text}

now test input is [2/18/11 18:04:02:230 PST] 0000000a ManagerAdmin I TRAS0017I: The startup trace state is *=info.

Now when i give the input and mention the pattern explicitly as grok.match("%{WSLOG}") it works. i can see the capture. But when i give grok.discover(input) then it does not gives me wslog it gives me
[%{DATE} %{ISO8601_SECOND}:%{HOSTPORT} PST] 0000000a ManagerAdmin I TRAS0017I: The startup trace state is *=info.

it does not give me wslog. Is it because discover uses some default pattern file and not the user specified file?

my code:

#!/usr/bin/env ruby
#

require "rubygems"
require "grok-pure"
require "pp"

grok = Grok.new


grok.add_patterns_from_file("grok-patterns")

input = "[2/18/11 18:04:02:230 PST] 0000000a ManagerAdmin  I   TRAS0017I: The startup trace state is *=info."
pattern = grok.discover(input) # this gives me [%{DATE} %{ISO8601_SECOND}:%{HOSTPORT} PST] 0000000a ManagerAdmin  I   TRAS0017I: The startup trace state is *=info.
#pattern ="%{WSLOG}" #this works properly
puts "Input: #{input}"
puts "Pattern: #{pattern}"
grok.compile(pattern)


match = grok.match(input)
puts match
puts "Resulting capture:"
pp match.captures