文本框TextChanged事件
systemready = False
Dim s As String = e.sender.text.replace(" ", "")
Dim p As String = ".{2}(?!$)"
Dim rgx = New System.Text.RegularExpressions.Regex(p, System.Text.RegularExpressions.RegexOptions.IgnoreCase)
Dim idx As Integer = e.sender.SelectionStart
e.sender.Text = rgx.Replace(s, "$0 ")
e.Sender.SelectionStart = idx + s.length \ 2
systemready = True