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The site OriginalGiff mentioned is very good. Another very helpful site is regexlib[^]; they have a large library of Regular Expressions. They also have a RegEx tester[^].
Just because the code works, it doesn't mean that it is good code.
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I second expresso it's an awesome tool!
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"Real men drive manual transmission" - Rajesh.
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You're welcome!
Good little tool, isn't it?
I was going to write one myself, but when I found this...
Those who fail to learn history are doomed to repeat it. --- George Santayana (December 16, 1863 – September 26, 1952)
Those who fail to clear history are doomed to explain it. --- OriginalGriff (February 24, 1959 – ∞)
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I endorse that. Expresso is a very good regex utility.
If there is one thing more dangerous than getting between a bear and her cubs it's getting between my wife and her chocolate.
modified 6-Feb-14 5:18am.
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WTF??? I hate Trend. This is what I get when trying to download Expresso.
Trend Micro OfficeScan Event
URL Blocked
The URL that you are attempting to access is a potential security risk. Trend Micro OfficeScan has blocked this URL in keeping with the network security policy.
URL: http://www.ultrapico.com/ExpressoSetup3.msi
Risk Level: Dangerous
Details: Verified fraud page or threat source
 
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Strange...I downloaded it here and ran a scan on the MSI and it showed nothing.
So I uploaded it to Dropbox: https://www.dropbox.com/s/3fwe3wtop741hpf/ExpressoSetup3.msi[^] - does that help?
Those who fail to learn history are doomed to repeat it. --- George Santayana (December 16, 1863 – September 26, 1952)
Those who fail to clear history are doomed to explain it. --- OriginalGriff (February 24, 1959 – ∞)
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Ah thanks. I'll grab it from home since DB is also blocked at work.
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They are a friendly bunch, aren't they? 
Do they allow you access to anything? 
Those who fail to learn history are doomed to repeat it. --- George Santayana (December 16, 1863 – September 26, 1952)
Those who fail to clear history are doomed to explain it. --- OriginalGriff (February 24, 1959 – ∞)
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Yip, at least I can get onto CP, LOL.
No social sites, so I hope they don't investigate the full capabilities of CP   
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gack! 
i suppose it's a right of passage everyone has to go through. but whew
me, i avoid regex like the plague. finite state machines are so much easier to understand and maintain.
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I had a bit help from an experienced colleague
The challenge is that it validates a Syslog-Timestamp.
Problem? Yes. Here are some examples of valid timestamps:
2014-2-5T21:36:14.315Z-1.5
2014-2-5T21:36:14Z-1
2004-2-28T21:36:14.315Z+1.75
2004-2-29T21:36:14.315315Z+0
You see the problem 
Clean-up crew needed, grammar spill... - Nagy Vilmos
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Marco Bertschi wrote: it validates a Syslog-Timestamp
If it was written to some sort of log file by some application, why would you doubt it?
Edit: Now that I have perused the timestamp part of the RFC, I can state, "those are not valid timestamps".
This space intentionally left blank.
modified 5-Feb-14 17:31pm.
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I am probably misinterpreting the RFC 5424 spec that you mentioned below and/or a case of complete RegEx ignorance, but from this site[^] it states that a timestamp can be a NILVALUE (where: NILVALUE = "-"). Do you account for this in your code?
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You are right - The timestamp can be a NILVALUE!
The RegEx is used within the class SyslogTimestamp (see the discussion [^] why I don't use System.DateTime).
There is another class, called SyslogMessageHeader, which has a field of type SyslogTimestamp.
I plan to handle a NILVALUE as null, and also treat null objects as if they represent a NILVALUE.
Clean-up crew needed, grammar spill... - Nagy Vilmos
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Marco Bertschi wrote: 2004-2-29T21:36:14.315315Z+0
Just curious, how could Regex invalidate this timestamp:
2005-2-29T21:36:14.315315Z+0
or:
2100-2-29T21:36:14.315315Z+0
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I have updated the RegEx meanwhile:
new Regex(@"(\d{4})-(0?[1-9]|1[0-2])-([0-2]?\d|3[0-1])T?([0-1]?\d|2[0-3]):([0-5]?\d):([0-5]?\d)\.?(\d{0,6})?Z?([+-]?\d\.?\d?|\d{2}?|[0]?1[0-2]\.?\d?|\d{2}?)?", RegexOptions.IgnoreCase);
Clean-up crew needed, grammar spill... - Nagy Vilmos
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I can't agree more with your last statement!
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You gotta love the regex. It is amazing.
I may not last forever but the mess I leave behind certainly will.
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Marco Bertschi wrote: 2014-2-5T21:36:14.315Z+1.5
Almost, but not quite, entirely unlike ISO 8601.
This space intentionally left blank.
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It's RFC 5424.
Clean-up crew needed, grammar spill... - Nagy Vilmos
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Reading the RFC leads me to think that it is supposed to be ISO 8601-compliant, but the values you show are not:
0) Missing leading zeroes on single-digit values
1) Time zone should be Z or offset; not both
2) The offset should not have a decimal -- it's hours and minutes
This space intentionally left blank.
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PIEBALDconsult wrote: 0) Missing leading zeroes on single-digit values
I know - I decided to allow missing leading zeros in my parsing application. Whatsoever, the returned value from the ToString method will add these leading zeros.
PIEBALDconsult wrote: 1) Time zone should be Z or offset; not both
PIEBALDconsult wrote: 2) The offset should not have a decimal -- it's hours and minutes
And here I can't quite follow you anymore. Do you mind explaining it?
Clean-up crew needed, grammar spill... - Nagy Vilmos
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Marco Bertschi wrote: And here I can't quite follow you anymore. Do you mind explaining it?
See Wikipedia[^].
The 'T' date time delimiter may be omitted according to the standard and is often replaced by a space for better human readability (which does not conform to the standard). So you may replace [T] by [T ]?.
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Thank you
Clean-up crew needed, grammar spill... - Nagy Vilmos
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