CODEWITHSUNDEEP
c#regex
Himberjack
Himberjack

Reputation: 5792

Help with Regex C#

I am trying to find some patterns. they can be:

1. "fourty|40;TOFIND|1234;fifty|50"
2. "TOFIND|1234;fifty|50"
3. "fourty|40;TOFIND|1234"

as you can see, the TOFIND|1234 can appear inside the statement (before ; and after ;), or it can have only before ; or it can have none.

It should NOT include examples:

MTOFIND|1234;
;TOFIND|1234Q

How can I find it?

I tried: Regex re = new Regex("TOFIND|1234" + "[;?]");

But I am not sure its correct.

Please help!

Thanks

Upvotes: 0

Views: 107

Answers (6)

Erick Petrucelli
Erick Petrucelli

Reputation: 14872

Based on your comments and edits, here we go... This is the Regex that you could use:

Regex r = new Regex(@";?[^\w](TOFIND\|1234)[^\w];?");

So, using the folowing samples:

1. "fourty|40;TOFIND|1234;fifty|50"
2. "TOFIND|1234;fifty|50"
3. "fourty|40;TOFIND|1234"
4. "MTOFIND|1234;"
5. ";TOFIND|1234Q"
6. "some|15;TOFIND|1234;"
7. ";TOFIND|1234;blabla|100"

It will match the lines 1, 2, 3, 6 and 7.

Let's explain the rules:

";?"  // We need 0 or 1 semi-colon before.
"[^\w]"  // We can't have any char (a-zA-Z0-9) before.
"(TOFIND\|1234)"  // We must have exactly TOFIND|1234.
"[^\w]"  // We can't have any char after.
";?"  // We need 0 or 1 semi-colon after.

If I understood well all your needs, thats it.

Upvotes: 0

yas4891
yas4891

Reputation: 4862

To get the lines that contain TOFIND

@"TOFIND\|.*|.*;TOFIND.*"

I found this tool over here to be of great help: Rad Software Regular Expression Designer

Upvotes: 0

Hogan
Hogan

Reputation: 70513

I would do it like this

string FindIt(string inStr)
{
    for each (string item in inStr.Split(new char [] {';'}))
    {
       string [] eles = item.Split(new char [] {'|'});
         if (eles[0] == "TOFIND")
           return eles[1];
    }
    return "";
}

Upvotes: 0

Yuri
Yuri

Reputation: 81

You my try this: ";?TOFIND|1234;?" This will include ";"s in the match.

Upvotes: 0

ShaneBlake
ShaneBlake

Reputation: 11096

Regex re = new Regex("(?:[^;])TOFIND\|1234(?=[;$])");

Upvotes: 0

Erick Petrucelli
Erick Petrucelli

Reputation: 14872

What about any character before or after the exact string TOFIND|1234?

Regex re = new Regex(".*(TOFIND\|1234).*");

Upvotes: 1

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