<?php
echo @#a:@#.htmlspecialchars($a);
echo @#<br>a1:@#;
$a1 = eregi_replace(@#(^[_.][:alnum:]-]+@([[:alnum:]][[:alnum:]-]*.)+[[:alpha:]]{2,3}$)@#,@# <a href="mailto:\1">\1</a> @#, $a) ;
echo htmlspecialchars($a1);
echo "<br>a1:$a1";
echo @#<br>a2:@#;
$a2 = eregi_replace(@#([[:alnum:]]+://([[:alnum:]][[:alnum:]-]*\.)+[[:alpha:]]{2,3}([#\?/\\][^#\?/\\][:space:]][^[:space:]]*)?)@#,
@#<a href="\1" target="_blank">\1</a>@#, $a);
echo htmlspecialchars($a2);
echo "<br>a2:$a2";
// eregi(@#^[_.][:alnum:]-]+@([[:alnum:]][[:alnum:]-]*\.)+[[:alpha:]]{2,3}$@#,$a) or die("not a email");
?>
<form name="f">
<input name="a" value="<?php echo $a; ?>">
<input type="submit" >
</form>
</body>
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