Get a substring from a qutoed string using C# regex

Azhar Rahi

Hi
I have a string "\"David\"". I want to read David using C# Regex. What I have done is here:

string strNamePattern = @"^[a-zA-Z][a-zA-Z0-9\ '-]*$";
Regex re = new Regex(strNamePattern);
Match match = re.Match(strLastName);

but match.Success does not return true, so I could not get match.Value. I want that if Lastname contains any single or double quotes at starting and ending position, then it must read the substring within that double or single quote

5 Replies

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Jignesh Kumar6y ago
Accepted answer
Hi Azhar,

You can try this one to this mothod to remove multiple occurence,
static void Main(string[] args)
{
            string emailId = "xyz@[email protected]";
            FindSecondOccurence(emailId, '@');
}

private static void FindSecondOccurence(string emailId, char chartoToReplace)
        {
            StringBuilder sb = new StringBuilder();

            int counter = 0;
            if (!String.IsNullOrEmpty(emailId))
            {
                foreach (var item in emailId)
                {
                    if (Convert.ToChar(item) == chartoToReplace)
                    {
                        counter++;
                        if (counter <= 1)
                            sb.Append(item);
                    }
                    else
                    {
                        sb.Append(item);
                    }
                }
                Console.WriteLine(sb.ToString());
            }
        }
Arvind Kushwaha6y ago
Hi Azhar,

In javascript it can be achieved like this;

var email = " xyz@[email protected]";

email.replace("@",",").replace("@","").replace(",","@")
console.log(email);
Azhar Rahi6y ago
Thanks Arvind Kushwaha. This worked. Jignesh Kumar links also worked.
However I have another issue.
I have email xyz@[email protected] being read from a csv file. It has two @ characters.

My supervisor is asking that it should replace the 2nd @ from email using regular expression. That means the system should accept email after removing the 2nd @ by itself.

Currently I have IsMatch method on email so it does not match, it rejects email id. Is there any way we can achieve to remove 2nd character using regular expression and make it acceptable for IsMatch method?
Arvind Kushwaha6y ago
Hi Azhar,

Please try this code
string strLastName = "\"David\"";
string strNamePattern = @"([A-Z])\w+";
Regex re = new Regex(strNamePattern);
Match match = re.Match(strLastName);
Console.WriteLine(match.Value);
Console.ReadLine();
Jignesh Kumar6y ago
Hi,

Please try this link which will help you,
https://www.c-sharpcorner.com/blogs/replace-special-characters-from-string-using-regex1
https://stackoverflow.com/questions/21388090/how-to-replace-all-special-character-into-a-string-using-c-sharp/21388249