Facing Problem while generate random number

Hi guys . I want to generate a string whose first 4 character that is - T793XXXXXXX(will remain fix) and the rest 7 X will replace random number.

Can you guys tell me what will be the function input string i have to write in ob.

Ex- T7937554408

  input = "T793?d?d?d?d?d?d?d"
  => VAR @rand

Syntax of random function in case you need.

?d = Digit
?l = Lower Case
?u = Upper Case
?s = Symbol
?h = Hex(loweCase)
?m = Upper + Digits
?a = any

You can find extra info in the UI as well

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