c# - Why doesn't this Regex match the date part of the input? -

i attempting take object's text value, obtain information through regex, , type output notepad. below code, , object references correct. have been able type other information notepad, including full text of object regex trying extract, assume there problem match.groups[1].value, can't seem figure out.

string pattern= @".*[0-9]{1,2}/[0-9]{1,2}/[0-9]{4}\s[0-9]{1,2}:[0-9]{1,2}:[0-9]{1,2}\s(a|p)m$"; string input = repo.changedbydate.element.getattributevaluetext("text");  match match = regex.match(input, pattern);  string dateregex = match.groups[1].value;  notepad.textbox.presskeys(dateregex); 

edit: apologies, posted , without more pertinent information.

the above code meant match date/time portion of string original text is:

current date , time is: 8/7/2013 12:15:02 pm 

so want extract 8/7/2013 12:15:02 pm regex assigned pattern.

as of now, no output being placed notepad. however, if change code following:

string input = repo.changedbydate.element.getattributevaluetext("text");  notepad.textbox.presskeys(input); 

my output in notepad current date , time is: 8/7/2013 12:15:02 pm

the .* in regex match start of string. can exclude entirely, , group 0 (all content matched regex). note should checking success before accessing groups.

string pattern= @"[0-9]{1,2}/[0-9]{1,2}/[0-9]{4}\s[0-9]{1,2}:[0-9]{1,2}:[0-9]{1,2}\s[ap]m";  match match = regex.match(input, pattern);  if (match.success) {   string dateregex = match.groups[0].value;   notepad.textbox.presskeys(dateregex); }