Code hangs in foreach of matchcollection of regular expression

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C#

Hi
Here is the program which collects email id in bunch of documents.
it extracting the email ids correctly but it hang after some time.
here is the code

string strmatch = string.Empty;
string strPattern = string.Empty;
Regex rxPattern = null;
MatchCollection Mcoll = null;
strPattern = GetEmailPattern();
if (strPattern.Trim() != "")
{
rxPattern = new Regex(strPattern, RegexOptions.Compiled);
Mcoll = rxPattern.Matches(strResumeContent);
foreach (Match rxMatch in Mcoll)
{
	strmatch = rxMatch.Value.ToString().Trim();
	if (strmatch != string.Empty && ValidateEmail(strmatch) == true && !IsExistEmailId(strmatch))
	{
	    procMyApp_DisplayFiles(strmatch, strFileWithPath);
	    //Application.DoEvents();
	    procMyApp_StatusMsg("\\ ... " + strFileWithPath,
vsfDisplayEmaillAddress.Rows.Count.ToString(),mlngFileCount);
	}
}

}

This is the Regular expression which i am using to find email address in documents

([a-mo-zA-MO-Z0-9]|((?<!\\\\)(n|N)))+([a-zA-Z0-9\\.\\!\\$\\&\\'\\*\\+\\^_\\`\\{}-]+)*@[a-zA-Z0-9-]+(\\.[a-zA-Z0-9-]+)*\\.([a-zA-Z]{2,})

The code hangs on the foreach of matchcollection
can anyone help me to overcome the problem
waiting for an solution
regards
kumaran