My apologies. I didn't look at the expression closely enough and jumped to the wrong conclusion. I have a better understanding of it now.

If you're expecting the user to provide text to match literally (as opposed to a regular expression pattern), then you need to convert the text into a regular expression pattern. In Perl, quotemeta would do. It will probably do for your database as well. 

my $input = '[';
$sth->execute(quotemeta($input));

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In reply to Re^5: postgres reg expression quoting by ikegami
in thread postgres reg expression quoting by zdzieblo

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