(\S+): matches one or more non-white-space characters. This is the first capturing group.
Imports System.Text.RegularExpressions
Module Example
Public Sub Main()
Dim pattern As String = "\b(\S+)\s*"
Dim input As String = "This is the first sentence of the first paragraph. " + _
"This is the second sentence." + vbCrLf + _
"This is the only sentence of the second paragraph."
For Each match As Match In Regex.Matches(input, pattern)
Console.WriteLine(match.Groups(1))
Next
End Sub
End Module