Split line based on specific pattern using Regex

[tariqondego]

i need to split lines in text file based on a specific pattern.The pattern is " 01/12/12 00:39 AT400003".

The source file looks like:

AT400003 2012-12-01 00:36:03.000 abcdefghij 01/12/12 00:39 AT400003 abcdefjhij 01/12/12 01:39 AT400003 abcdefghij 01/12/12 00:39 AT400003 abcdefjhij

I need the output file to look like:

AT400003 2012-12-01 00:36:03.000 abcdefghij
01/12/12 00:39 AT400003 abcdefjhij
01/12/12 01:39 AT400003 abcdefghij
01/12/12 00:39 AT400003 abcdefjhij

But I get:

AT400003 2012-12-01 00:36:03.000 abcdefghij
abcdefjhij
abcdefghij
abcdefjhij

Below is the code:

string[] lines = System.Text.RegularExpressions.Regex.Split(keep, @"\s\s\s\d\d\/\d\d\/\d\d\s\d\d\:\d\d\s\s\w\w\d\d\d\d\d\d");
foreach (string line in lines)
{ sw.WriteLine(line); }
Please advise how i can have the split expressions also included

[tariqondego]

I have solved this:added a positive look ahead to the expression.(?=...)
string[] lines = System.Text.RegularExpressions.Regex.Split(keep, @"(?=\s\s\s\d\d\/\d\d\/\d\d\s\d\d\:\d\d\s\s\w\w\d\d\d\d\d\d)");
foreach (string line in lines)
{ sw.WriteLine(line); }