#!/usr/bin/perl -w

use strict;
use warnings;

open(FH, "Wachterpdf2txt.txt") or die "We have a problem: $!";

my @invoiceSearch = ("phone", "hunt", "dial", "tone", "static", "18d", "system", "voice", "numbers", "voicemail", "MLX201", "programming", "extension", "processor", "block", "mls", "programmed", "rollover", "extension", "partner", "crosstalk", "merlin", "ringing");

my $regexStr="^static\\s+\\w+\\s+(" . (join "|",map quotemeta,@invoiceSearch) . ")\\W.*";

print "$regexStr\n\n";

my $regexStr_rr = qr{$regexStr}i; # or "cloister" the 'i' in $regexStr

while(<FH>) {
   chomp;
    my ( $hit )
        = $_ =~ /$regexStr_rr/;
  
    if ($hit) {
        print "Beatle method \"$hit\" found on this line: $_\n";
    }
    else {
        print "No Beatle method found on this line: $_\n";
    }
}