Hi,
Actually, you can use "Alternation" in your Regular Expression. For the mentioned case it may look like:
web_reg_save_param_regexp(
"ParamName=CorrelationParameter_2",
//"RegExp=idpersona=(.*?)&primeraopcion",
"RegExp=[idpersona|id_alumno]=(.*?)&primeraopcion",
SEARCH_FILTERS,
"Scope=Headers",
"IgnoreRedirections=No",
"RequestUrl=*/index.php*",
LAST);
Regards,
Leonid.