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<?php
$kaynak  = "<a href='x' class='title' onClick='bilmemne();' target='_blank'>
<a href='y' class='title' onClick='bilmemne();' target='_blank'>
<a href='z' class='title' onClick='bilmemne();' target='_blank'";
preg_match("|<a href='([^']*)'.*|iU",$kaynak,$hede);
print_r($hede);
?>