I am using s///eeg but I have to append a } in order to get the eval to work. I could use something cleaner than what follows: 
>perl -e "$ab=q({eval   { return 1*100 }  } iiilll {
eval {return 'mark'}}); $ab=~s/\{\s*eval([^\}]+)\}\s*\}/qq($1})/eeg; p
+rint $ab;
if ($@) {print qq(\nERROR\n$@)};"

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In reply to Cleaner Regex by InfiniteSilence

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