Regular Expression Search/Replace in ASP.NET

Hello and thanks in advance for any assistance.

I have an ASP.NET application that sends emails out. I have a static HTML template with variable identifiers which look like this: %%VariableData%%

When an email gets sent, all the variables in the template are simply replaced using a String.Replace function.

My problem is that using the "%%.*%%' regular expression it will find things like this: %%strSchoolURL%%/Login.aspx?Email=%%strEmailAddress%% as one big variable instead of finding one instance of %%strSchoolURL%% and one instance of %%strEmailAddress%%.

I'm thinking it's just a matter of fine tuning the regular expression.

Any hints would be greatly appreciated.

String valueRegex = @"%%.*%%";
strEmailText = // Read in static .html text
 
// Define a regular expression for repeated words.
Regex rx = new Regex(@"%%.*%%", RegexOptions.Compiled | RegexOptions.IgnoreCase);
 
                if (Regex.IsMatch(strEmailText, valueRegex))
                {
                    // Find matches.
                    MatchCollection matches = rx.Matches(strEmailText);
 
                    foreach (Match match in matches)
                    {
                        GroupCollection groups = match.Groups;
 
                        //replace variables in the email text with values from DB
                        #region Switch Cases
                        switch (groups.SyncRoot.ToString())
                        {
                            case "%%strSchoolContact%%":
                                {
                                    replacementText = ds.Tables[0].Rows[0]["strSchoolContact"].ToString();
                                    strEmailText = strEmailText.Replace("%%strSchoolContact%%", replacementText);
                                    break;
                                }
// etc, etc for every defined variable element
}
}

Select allOpen in new window