I'm having a similar problem here if I pass a numeral inside $searchenquiry
$searchenquiry = "1.0.1 Retrospective bibliographies and checklists / bibliographies
et r�pertoires r�trospectifs";
preg_replace ('/('.$searchenquiry.')/i' , "<b>$1</b>", $mydata->RB)
error: Unknown modifier 'b' in <b>/www-html/new1/db/display.table.inc</b> on line
<b>103</b>
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