If the "solution" is 
print if /\Q$pattern\E/;

[download]
then $pattern doesn't contains a regexp pattern as its name implies. The variable should be renamed 
my $search_str = $1;
...
print if /\Q$search_str/;

[download]
or quotemeta should be called earlier. 
my $pattern = quotemeta($1);  # aka "\Q$1"
...
print if /$pattern/;

[download]

In reply to Re^2: regex search fails by ikegami
in thread regex search fails by stephanm

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