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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