echo 'a:'.htmlspecialchars($a);

echo '
a1:';

$a1 = eregi_replace('(^[_.][:alnum:]-]+@([[:alnum:]][[:alnum:]-]*.)+[[:alpha:]]{2,3}$)',' \1 ', $a) ;

echo htmlspecialchars($a1);

echo "
a1:$a1";

echo '
a2:';

$a2 = eregi_replace('([[:alnum:]]+://([[:alnum:]][[:alnum:]-]*\.)+[[:alpha:]]{2,3}([#\?/\\][^#\?/\\][:space:]][^[:space:]]*)?)',

'\1', $a);

echo htmlspecialchars($a2);

echo "
a2:$a2";

// eregi('^[_.][:alnum:]-]+@([[:alnum:]][[:alnum:]-]*\.)+[[:alpha:]]{2,3}$',$a) or die("not a email");

?>