php正则入门,实习email和URL验证

2024-09-04 11:47:30

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匹配email地址的正则表达式：w+([-+.]w+)*@w+([-.]w+)*.w+([-.]w+)*

匹配网址url的正则表达式：[a-za-z]+://[^s]*

下面看一实例,代码如下:

<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>