Two Digit next dot two digit next dot twodigittwoalphabets using regex in singleline of text field : Hi I need the digit to be displayed as follows
00.11.12aa or 00.12.55 or 11.48.61d

starts with 2 digit and decimal then 2 digit then decimal then twodigit or twodigit one alpha or twodigit two alpha. 

I need to validate in single line of text field. Please tell me how to do it.