Oracle 11g Release 2

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with a as (
  select 1 as id, '{([option1]+[option2])*([option3]+[option4])}' as pattern from dual union all
  select 2 as id, '{([option1]+[option2])*([option3]+[option4])*([option6]+[option7])}' as pattern from dual union all
  select 3 as id, '{[option1]+[option6]}' as pattern from dual union all
  select 4 as id, '{([option1]+[option2])*([option8]+[option9])}' as pattern from dual union all
  select 5 as id, '{([option1]+[option2])*[option4]}' as pattern from dual union all
  select 6 as id, '{[option10]}]' as pattern from dual
)
, opt as (
  select 'option1' as opt, 3653265 as val from dual union all
  select 'option2' as opt, 26452 as val from dual union all
  select 'option3' as opt, 73552 as val from dual union all
  select 'option3' as opt, 100 as val from dual union all
  select 'option4' as opt, 1235 as val from dual union all
  select 'option5' as opt, 42565 as val from dual union all
  select 'option6' as opt, 2330 as val from dual union all
  select 'option7' as opt, 544 as val from dual union all
  select 'option9' as opt, 2150 as val from dual
)
, opt_ordered as (
  /*Order options to iterate over*/
  select opt.*, row_number() over(order by 1) as rn
  from opt
)
, rec (id, pattern, repl_pattern, lvl) as (
  select
    id,
    pattern,
    pattern as repl_pattern,
    0 as lvl
  from a
  
  union all
  
  select
    r.id,
    r.pattern,
    /*Replace each part at new step*/
    replace(r.repl_pattern, '[' || o.opt || ']', o.val),
    r.lvl + 1
  from rec r
    join opt_ordered o
      on r.lvl + 1 = o.rn
)
, out_prepared as (
  select
    rec.*,
    case
      when instr(repl_pattern, '[') = 0
      /*When there's no more not parsed expressions, then we can try to evaluate them*/
      then dbms_xmlgen.getxmltype(
        'select ' || replace(replace(repl_pattern, '{', ''), '}', '')
        || ' as v from dual'
      )
      /*Otherwise SQL statement will fail*/
    end as parsed_expr
  from rec
  /*Retrieve the last step*/
  where lvl = (select max(rn) from opt_ordered)
)
select
  id,
  pattern,
  repl_pattern,
  extractvalue(parsed_expr, '/ROWSET/ROW/V') as calculated_value
from out_prepared o
where extractvalue(parsed_expr, '/ROWSET/ROW/V') > 0

ID	PATTERN	REPL_PATTERN	CALCULATED_VALUE
1	{([option1]+[option2])*([option3]+[option4])}	{(3653265+26452)*(73552+1235)}	275194995279
2	{([option1]+[option2])([option3]+[option4])([option6]+[option7])}	{(3653265+26452)(73552+1235)(2330+544)}	790910416431846
3	{[option1]+[option6]}	{3653265+2330}	3655595
5	{([option1]+[option2])*[option4]}	{(3653265+26452)*1235}	4544450495