CODEWITHSUNDEEP
c#regex
Shantanu Banerjee
Shantanu Banerjee

Reputation: 1447

match regex patten between two pattern

Hi I am newbie in RegEx operations. I have a text like

[JUNCTIONS]
;ID                 Elev            Demand          Pattern         
 3                  50              100                                 ;
 4                  50              30                                  ;
 5                  50              20                                  ;
 6                  40              20                                  ;
 7                  50              5                                   ;
 8                  30              5                                   ;
 9                  30              5                                   ;
 2                  50              80                                  ;
 10                 50              70                                  ;
 11                 50              30                                  ;
 12                 50              52                                  ;
 13                 50              40                                  ;
 14                 50              40                                  ;
 15                 50              10                                  ;
 16                 50              10                                  ;
 17                 50              10                                  ;
 18                 0               0                                   ;
 19                 0               0                                   ;

[RESERVOIRS]
;ID                 Head            Pattern         
 1                  100                                 ;

[TANKS]

I want to create a pattern and output the text between [JUNCTIONS] and [RESERVOIRS] then [RESERVOIRS] to [TANKS] then so on. [XXXX] is not known to me. I want to get text inside [XXX] to [XXX]. How can i do that?

Upvotes: 0

Views: 127

Answers (3)

Kjartan
Kjartan

Reputation: 19121

Why use a regex?

Assuming you can read this input text one line at a time, it will probably be quicker and easier to just loop over the lines, and output those you need. Some variant of:

Update:

In response to you comment below; you can probably use this to skip any lines with [something] in them, and print out the rest:

// Pattern: Any instance of [] with one or more characters of between them:
var pattern = @"\[.+\]"; 
while((line = file.ReadLine()) != null)
{
    if(!Regex.IsMatch(line, pattern)) // Skip lines that match
    {
        Console.WriteLine(line);
    }      
}

Upvotes: 1

dtyler
dtyler

Reputation: 1428

Here is some c# code to do the match, and get the results.

Be sure to add error checking, for example to make sure that the match actually worked.

Note the Singleline flag - this lets the dot (.) match all characters, including newlines. You'll also probably need to cleanup and trim the output, to remove any trailing newlines, etc.

MatchCollection matches = Regex.Matches(test, @"^\[JUNCTIONS\](.*)\[RESERVOIRS\](.*)\[TANKS\](.*)$", RegexOptions.Singleline);
GroupCollection groups = matches[0].Groups;

// JUNCTIONS text
Console.WriteLine(groups[1]);

// RESERVOIRS text
Console.WriteLine(groups[2]);

Edit - Updated to match OP's changes

If you want to match an unspecified number of matches, its a little trickier. This regex will match a [TEXT] block and anything that comes after it, until it its a [ character. The way to use this regex is to loop over the MatchCollection for each region, and use .groups[1] for the text and .groups[2] for the body.

MatchCollection matches = 
    Regex.Matches(test, @"\[([\w+]+)\]([^\[]+)?", RegexOptions.Singleline);

// for each block / section of the document
foreach(Match match in matches){

     GroupCollection groups = match.Groups;
     // [TEXT] part will be here
     Console.WriteLine(groups[1]);

     // The rest will be here
     Console.WriteLine(groups[2]);

 }

Upvotes: 1

Sabuj Hassan
Sabuj Hassan

Reputation: 39395

Here is the regex:

(?=(\[\S+\].*?\[\S+\]))

or

(?=(\[(?:JUNCTIONS|RESERVOIRS)\].*?\[(?:RESERVOIRS|TANKS)\]))

Assuming you want to handle all the [...] things from your input.

Note: Use the make sure you are handling multiple line regex matching from your c#. And don't for get to escape the \ character if you need.

Upvotes: 1

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