Regular Expression - 2 letters and 2 numbers in C

Question

I am trying to develop a regular expression to validate a string that comes to me like   TE33  or  FR56  or any sequence respecting 2 letters and 2 numbers   The first 2 characters must be alphabetic and 2 last caracters must be numbers   I tried many combinations and I didn t have success  Last one I tried   if Regex IsMatch myString     A-Za-z  2  0-9  2

User · Answer

This should get you for starting with two letters and ending with two numbers    A-Za-z  2      0-9  2    If you know it will always be just two and two you can   A-Za-z  2  0-9  2

User · Answer

You re missing an ending anchor   if Regex IsMatch myString     A-Za-z  2  0-9  2  z                    Here s a demo     EDIT  If you can have anything between an initial 2 letters and a final 2 numbers   if Regex IsMatch myString      A-Za-z  2    d 2  z                    Here s a demo

User · Answer

Just for fun  here s a non-regex  more readable maintainable for simpletons like me  solution   string myString    AB12    if  Char IsLetter myString  0   amp  amp       Char IsLetter myString  1   amp  amp       Char IsNumber myString  2   amp  amp      Char IsNumber myString  3            First two are letters  second two are numbers   else          Validation failed     EDIT  It seems that I ve misunderstood the requirements  The code below will ensure that the first two characters and last two characters of a string validate  so long as the length of the string is   3   string myString    AB12    if myString Length  gt  3            if  Char IsLetter myString  0   amp  amp           Char IsLetter myString  1   amp  amp           Char IsNumber myString   myString Length - 2    amp  amp          Char IsNumber myString   myString Length - 1                 First two are letters  second two are numbers               else              Validation failed         else         Validation failed

[c#] Regular Expression - 2 letters and 2 numbers in C#

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