正则表达式判断email和URL,帮忙看看有没有要补充的.
<body onload="f.a.select();">
<?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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