How to increment alphanum value in Jmeter inside a loop counter

Question

I have requirement with increment value for each iteration and using loop controller. I tried with the _V function and __intSum(${myVar},${__counter(,)},)}. it's incrementing only for digit and not for AlphaNum . my paylody body like this.

{
"name":"BAN401"
}

I'm using like below.

{
"name":${__intSum(${FirstName},${__counter(,)},)}"
}

Answer 1

1. Amend your body data as:

   {
   "name":"${FirstName}"
   }
   

2. Add JSR223 PreProcessor as a child of the request which payload you need to increment

3. Put the following code into "Script" area:

   def numericPart = (vars.get('FirstName') =~ /(\d+)/)[0][1] as int
   
   def incremented = numericPart + 1
   
   vars.put('FirstName', vars.get('FirstName').replace(numericPart as String, incremented as String))
   

4. That's it, each time the request will be called it will send an incremented value of the ${FirstName} JMeter Variable

Demo:

More information on Groovy scripting in JMeter: Apache Groovy - Why and How You Should Use It