I'm not familiar with using regexp's in SQL, but could you not join all the keywords into one regex? Ie, instead of doing 
foreach $keyword ( @keywords )
{
  $sql_stmt .= " AND ( PlantDescription REGEXP "s/\$keyword/" );"
}

[download]
you could do 
$keywords = join "|", @keywords;
$sql_stmt .= "AND ( PlantDescription REGEXP \"$keywords\" )";

[download]

In reply to Re: regex search by roju
in thread regex search by Anonymous Monk

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