is that a ` (`) or a ' (') ...

try something like this..

$test = q("`');   # double-quote left-single-quote plain-single-quote
                  # i'm not even sure what left/right-double-quote or
                  # right-single-quote would be on my keyboard =(

$inhex = unpack 'H*', $test;
@hexcodes = $inhex =~ m/(..)/g;
print "@hexcodes", $/;             # prints 22 60 27

# now i can s// with the hex representation of the character.

$test =~ s/\x60//g;                # remove any ` characters (hex 60)
print $test, $/;                   # prints "'
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