ruby on rails正则表达式

Question

I'm new to regular expressions and i'm feeling this very difficult to solve:

I have a the following string:

"inforun 7970 12423 99 10:03 ? 00:09:03 abcd -PR -gmh domain.den.abc.com -gmp 6020 -guid 9c06cc02-b1c8-41cf-93e6-1d795e9fff62 -rst 180 -s FOLDER_NAME:wkf_workflow.s_session -something Session task instance [session]"

I have to extract the time which 10:03 and the 'domain' in domain.den.abc.com and the FOLDER_NAME , the 'workflow' in the 'wkf_worklfow' and the 'session' in the 's_session' the time , domain , foldername , workflow and session keep changing for every string and there are a bunch of strings like this all attached as a single string. Here are the patterns that are common for every string. the 'abcd -PR -gmh' is common and can help in finding the time that is just before the '?' the '-s', ':wkf' is common for all the string and the folder_name is right in between these two. the 'workflow' is in between 'wkf_' and '.s_' the session is in between 's_' and the immediate next '-' I need the time, domain, folder name, workflow and session all in seperate strings. I tried to practice regular expression only a few days back it is taking so much time for me even to comprehend something like "\\A[\\w+\\-.]+@[az\\d\\-.]+\\.[az]+\\z" which is given here Thank you for your help

Answer 1

Regex (time $1 , domain $2 , folder name $3 , workflow $4 , session $5 ):

(?<=\s)(\d{2}:\d{2})(?=\s).*?(?<=\s)((?:[a-zA-Z\d]+(?:\-[a-zA-Z\d]+)*\.)+[a-zA-Z]{2,4})(?=\s).*?(?<=\s)([a-zA-Z\d_]+):wkf_([a-zA-Z\d]+)\.s_([a-zA-Z\d]+)(?=\s)

Ruby:

text = "inforun 7970 12423 99 10:03 ? 00:09:03 abcd -PR -gmh domain.den.abc.com -gmp 6020 -guid 9c06cc02-b1c8-41cf-93e6-1d795e9fff62 -rst 180 -s FOLDER_NAME:wkf_workflow.s_session -something Session task instance [session]"
text =~ /(?<=\s)(\d{2}:\d{2})(?=\s).*?(?<=\s)((?:[a-zA-Z\d]+(?:\-[a-zA-Z\d]+)*\.)+[a-zA-Z]{2,4})(?=\s).*?(?<=\s)([a-zA-Z\d_]+):wkf_([a-zA-Z\d]+)\.s_([a-zA-Z\d]+)(?=\s)/
puts $~.captures

Output:

10:03
domain.den.abc.com
FOLDER_NAME
workflow
session

See and test the code here .

Answer 2

Here's a regex you could use. I'm not familiar enough with Ruby/RoR to help there, but presuming you actually want to use a regex for it, this regex should get you everything in one go

^.* (\d\d?:\d\d) \? .*? -gmh (.*?)\..*? -s (.*?):wkf_(.*?)\.s_(.*?) .*$

http://regexr.com?31da7 should show the capturing groups and their contents

$1    $2     $3          $4       $5
10:03 domain FOLDER_NAME workflow session

It presumes the Time is immediately before the question mark and is formatted as digit (optional digit) colon digit digit, that the domain immediately follows '-gmh ', that the folder name follows the -s and precedes the :wkf_, the workflow follows the :wkf_, and that the session is after the .s_

Answer 3

Assuming you're using ruby 1.9, here's a starting point:

/(?<time>\d{2}:\d{2}:\d{2}) abcd -PR -gmh (?<domain>[a-zA-Z]*)/i =~ s
/-s (?<folder_name>\w*):wkf_(?<workflow>\w*)\.s_(?<session>\w*)/i =~ s

After running these two lines, you should have:

1.9.3p125 :023 > time
=> "00:09:03" 
1.9.3p125 :024 > domain
 => "domain" 
1.9.3p125 :025 > folder_name
 => "FOLDER_NAME" 
1.9.3p125 :026 > workflow
 => "workflow" 
1.9.3p125 :027 > session
 => "session" 

You still need to define what characters are allowed for each case and add error handling too.