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  1. or download this
    my $string = 'abc!hu(';
print "\Q$string\E\n";    # prints abc\!hu\(
print quotemeta $string;  # prints abc\!hu\(
  2. or download this
    s/\Q$string\E/$replacement/;

...

$qstring = quotemeta $string;
s/$qstring/$replacement/;
  3. or download this
    perldoc perlre
perldoc perlop (the m// part)
  4. or download this
    -- 
Joost       downtime n. The period during which a system
            is error-free and immune from user input.