ansaurus

Question

How to do ANDing of conditions in a regular expression?

Answer 1

+1 A:

I would break it down into a few simpler regex's to get these results. The first would select only the chunk of text between projects: (?=Project #).*(?<=Project #)
With the match that this produces, i would run a seperate regex to ask if it contains any of those words : client | duration | environment | technologies | role If this match comes back with a count of more then 2 distinct matches, you know to select the original string!

Edit:

string originalText;
MatchCollection projectDescriptions = Regex.Matches(originalText, "(?=Project #).(?:(?!Project #).)*", RegexOptions.IgnoreCase | RegexOptions.Singleline);
Foreach(Match projectDescription in projectDescriptions)
{
  MatchCollection keyWordMatches = Regex.Matches(projectDescription.value, "client | duration | environment | technologies | role ", RegexOptions.IgnoreCase);
  if(keyWordMatches.Distinct.Count > 2)
  {
    //At this point, do whatever you need to with the original projectDescription match, the Match object will give you the index etc of the match inside the original string.
  }
}

xoxo 2009-10-23 10:34:56

Thanks xoxo for help.Can you please describe how to break down this operation into different regex's? or give name of the book or link to tutorial or some help guide which explains this?As I am new in regex area, I have little knowledge about how to do it. I am using C# for this.Thanks for help.

Shekhar 2009-10-23 11:02:58

I hope the edit helps?

xoxo 2009-10-23 12:48:17

Answer 2

A:

Try

^(details of )?project.*?((client|duration|environment|technologies|role).*?){2}.*$

One note: This will also match if only one of the terms appears twice.

In C#:

foundMatch = Regex.IsMatch(subjectString, @"\A(?:(details of )?project.*?((client|duration|environment|technologies|role).*?){2}.*)\Z", RegexOptions.Singleline | RegexOptions.IgnoreCase);

Tim Pietzcker 2009-10-23 10:35:17

Sorry. I am using C# for this thing.The query which you have given fails at only one point.If String starts like "Details of project" then RE given by you wont work.Actually I had created same RE which u have given. How to handle this problem? Can we really solve this problem using RE or do we need to use some other approach?

Shekhar 2009-10-23 11:00:45

Well, what do you want? You said the string should start with "Project". Your own example string doesn't. What exactly is the condition that the string needs to match? Please edit your question to clarify.

Tim Pietzcker 2009-10-23 11:24:15

@Tim, Im sorry if I have confused you ppl.In the text that I have, project related information can start with "project" word itseld or it may start with "Details of project".I want to select project related information (like client, role, enviornment, technologies used) in both the cases.

Shekhar 2009-10-23 11:32:06

OK, I edited my answer. Hint: Edit your question, too, or other people will continue to give answers that won't work.

Tim Pietzcker 2009-10-23 11:54:20

Thanks.I will edit my question.

Shekhar 2009-10-23 11:58:54

OK, now suddenly you have two projects in one string. By now I think that one single regex won't cut it. No fair downvoting my answer though, if specifications change all the time...

Tim Pietzcker 2009-10-23 14:47:29

Answer 3

A:

Maybe you need to break that requirements in two steps: first, take your key/value pairs from your string, than apply your filter.

string input = @"Project #...";
Regex projects = new Regex(@"(?<key>\S+).:.(?<value>.*?\.)");
foreach (Match project in projects.Matches(input))
{
    Console.WriteLine ("{0} : {1}", 
        project.Groups["key"  ].Value, 
        project.Groups["value"].Value);
}

Rubens Farias 2009-10-23 11:24:57

Shekhar 2009-10-23 11:34:48

Answer 4

+2 A:

(client|duration|environment|technologies|role).+(client|duration|environment|technologies|role)(?!\1)

theraccoonbear 2009-10-23 21:51:05

ansaurus

tags:

views:

answers:

How to do ANDing of conditions in a regular expression?

related questions