I assume you want to return either $name or '(unknown)' including the () from your regex. 

$greet =~ s{#\{(\w+)\((\({0,1}\w+\){0,1})\)\}#}{$obj->{"$1"}->($2)}eg;

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In reply to Re: How to cater a self defined escape char in regex ? by hdb
in thread How to cater a self defined escape char in regex ? by exilepanda

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