Expression rule

The requirement is not clear. Share more details.

You can create a rule input of Text type and then pass comma-separated data in that.

How are you passing this value?

Also as Yogi Patel mentioned create a Rule input of text type and try this.

a!localVariables(
  local!value: ri!ruleInput,
  local!integer: cleanwith(local!value, "1234567890"),
  local!alphabet: stripwith(local!value, "123456789(),"),
  local!listOfInt: enumerate(tointeger(local!integer)) + 1,
  a!forEach(
    items: local!listOfInt,
    expression: concat(local!alphabet, fv!item)
  )
)

I would ask you to please share what you have tried and what exactly is the requirement. 

Hi, based on your input and output I am guessing you are trying to concatenate two inputs n number of times. if so, below snippet could be helpful

for

a!forEach(
  items: enumerate(ri!integer)+1,
  expression: concat(ri!text,fv!index)
)

Yogi Patel said:

The requirement is not clear.

I like defaulting to the laziest approach possible when the requirements aren't actually spelled out.  For instance, the result here is just a rule that returns "(A1;A2)", without specifying how the rule input (if any) is related to that (and my brain is too fried to try guessing).

So here's my initial rule suggestion:

"(A1;A2)"

Straightforwardness: 10/10.  Flexibility for different rule inputs: ??/10.

Less lazy reply:

let's pretend the rule input is actually 2 inputs, a character and a "times repeated".  I don't feel like writing a parser to accept a comma-separated value when that may have just been OP overly abbreviating what their input is going to be.

a!forEach(
  enumerate(ri!repeats),
  ri!character & fv!index
)

For "A" and 2, that gives us basically their prescribed output:

For "C" and "11", it performs more of the same: