With the same caveat of Caution!, that could be reduced to: 

$_ = 'ABCDEDBCA ABCDEFGFEDCBA'; 
s[([A-E])][ "func_$1" ]gee;;

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In reply to Re^2: Howto avoid large hard-coded else-if function calls by BrowserUk
in thread Howto avoid large hard-coded else-if function calls by neversaint

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