Conditional regular expression with one section dependent on the result of another section of the regex -

is possible design regular expression in way part of dependent on section of same regular expression?

consider following example:

(abchehg)[hge]{5,1230}(eejopk)[dm]{5}

i want continue regex, , @ point have section result of section should depend on result of [dm]{5}.

for example, d complemented c, , m complemented n.

(abchehg)[hghe]{5,1230}(eejopk)[dm]{5}[acf]{1,1000}(bbba)[cu]{2,5}[d'm']{5}

by d' mean c, , m' mean n.

so resulting string matches above regex, if has dddmm matching section [dm]{5}, should have cccnn matching [d'm']{5}. therefore, result of [d'm']{5} depends on [dm]{5}, or in other words, matches [dm]{5} dictates match [d'm']{5}.

is possible such thing regex?

please note that, in example have extremely over-simplified problem. regex pattern have more complex , longer , my actual pattern includes 5-6 of such dependent sections.

i cannot think of way can in pure regex. run 2 regex expressions. first regex extract [dm]{5} string, such as

(abchehg)[hghe]{5,1230}(eejopk)[dm]{5}

and take last 5 characters. replace characters, example in c# result = result.substring(result.length - 5, 5).replace('d', 'c').replace('m', 'n'), , concatenate like

(abchehg)[hghe]{5,1230}(eejopk)[dm]{5}[acf]{1,1000}(bbba)[cu]{2,5} + result