Try 

my $fullre = join '|', map { "\Q$_\E" } @full_list;
...
@grepnames = $holdit =~ m{($fullre)}g;

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In reply to Re: How can I find the occurrence of a variable in each line of an array by Anonymous Monk
in thread How can I find the occurrence of a variable in each line of an array by alicatserver

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