Hello, thanks to all for the wealth of knowledge here, it has been invaluable.. I have an issue that I can't seem to crack with my limited knowledge or searching.. Trying to parse through search-strings and extract all the non-control words. My input search-string might look like this:

"non$volatile display" and ((timer oR count$3 Or display) near5 hour).ccls. NOT (LCD).ab.

I would like to parse similar strings, extracting the search terms, and ignoring the control words (and their case) and everything between two periods, like .ccls. I would also like to preserve the wildcards and anything in "", like "non$volatile display" (where the $ can be anything, I could just keep the $.. and store anything between "" as a single string in the output. The output would be an array of the extracted substrings. Also, if there is a more efficient way to remove the dupes in this routine, I'm all ears..

My code so far is below - it manages to pull out all the abc substrings, ignoring lower-case control words and anything between periods.. Any thoughts? 

sub extract_terms(){
my $input = shift;
chomp $input;
my @searchterms = ($input =~ m/\b(?!\.)[a-z]+(?!\.)\b/gi);
my @omissions = qw(terms and or not with near same xor adj);

my %h;
@h{@omissions} = undef;
    
@searchterms = grep {not exists $h{$_}} @searchterms;
return @searchterms;
}

[download]

Which outputs (after sorting):

count, display, hour, LCD, non, NOT, Or, oR, timer, volatile,

In reply to Regex with multiple pattern omissions by jhoop

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