Use the "Hand over text (Regular Expression)" field of "Substitute list (with chain pre processor)" which is Pre-processor Handler's template.
*Parameter name included in the response
<input type = "text" name = "param_xx" value = "test">
*Parameters sent in the request
<How to change the "xx" part of the parameter "param_xx">
You can change the character string by setting as follows.
*field: Hand over text (Regular Expression)
*Assign place for hand over text: param _ ([^ =] +)
*Acquire hand over text information : name = "param _ ([^"] +)