Use regex to replace

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Hi,

How should check a string has (?) at the end and rename to (?+1) using regex.

ie.

string text = "node (1)";

change to...

string text = "node (2)";

Thanks.

Posted 12-Dec-13 23:03pm

mbos015

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Maciej Los 13-Dec-13 5:09am

Do you want to find ? or numeric value?

3 solutions

Solution 1

just write if condition if char == ? then char == ?+ nothing else

Posted 12-Dec-13 23:06pm

Gaurav Makwana

Comments

Maciej Los 13-Dec-13 5:14am

What?
As per i understand OP wants to find ? and replace it with numeric value. In your case, if you add char to char you'll get ? plus something else. Am i right?

Karthik_Mahalingam 13-Dec-13 5:24am

Gaurav, OP needs solution in Regex.

Gaurav Makwana 13-Dec-13 23:24pm

hey karthik i meant to say not write ?
just find syntax like that and dont need to use regex
fetch last character and check that character in if condition

Karthik_Mahalingam 13-Dec-13 23:50pm

Ok cool :)

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BobJanova · Accepted Answer · 2013-12-13T00:08:00

Solution 3

You can't do arithmetic with a regex. You can extract the current value with a regex (@"$(\d+)$$"), do arithmetic on it in code and then replace the value:

str = str.Substring(0, str.LastIndexOf('(')) + newValue + ")";

Posted 13-Dec-13 0:08am

BobJanova

Comments

Maciej Los 13-Dec-13 6:15am

+5!

mbos015 13-Dec-13 14:17pm

thanks your regex works sweet. starting to make sense of regex now. cheers.

Karthik_Mahalingam · Accepted Answer · 2013-12-12T23:47:00

Solution 2

Hi Try this code..

C#

string text = "node (1)";
            string pattern = @"\(([^)]*)\)";
            if (Regex.IsMatch(text, pattern))
            {
                int newValue = 0;
                string oldValue= Regex.Match(text, pattern).Groups[1].Value;
                if (int.TryParse( oldValue, out newValue))
                    newValue++;
                text = text.Replace(oldValue, newValue.ToString());
            }

Posted 12-Dec-13 23:47pm

Karthik_Mahalingam

Comments

mbos015 13-Dec-13 14:16pm

thanks worked well :), although the other suggestion using @"$(\d+)$$")

works better, because the $ makes sure its at the end of the string.

what does ([^)]*) do?

BobJanova 16-Dec-13 5:00am

This regex matches a left paren, then anything that isn't a right paren, then a right paren, and as you note it isn't tied to the end of the string. So for example in a string "CodeProject (UK) Ltd. (3)", this answer will match "UK" (and result in a string "CodeProject (0) Ltd. (3)") whereas mine will match "3".