尝试在提取的 html 页面上使用 preg_match 但这让我感到困惑
我已经尝试下面的脚本（在我正在开发的一个更大的应用程序中）几个小时了，我只是无法理解问题是什么，无论我得到什么“注意：未定义的偏移量：1”意味着它将结果从 preg_match 放入数组时遇到一些问题...我做了一个与之前类似页面几乎相同的过程，并且工作正常..我将非常感谢任何建议，因为我只是不知道该怎么做此时，因为我已经花了几个小时尝试解决这个问题，所以我没有大量的正则表达式经验，但我已经使用了相当多的它，我只是不知道是什么可能阻止它正常工作。
<blink>
<?PHP
$email_saved_page = '
<meta name="viewport" content="width=device-width"/>
<title>Sign in to Hushmail Mobile</title>
<style type="text/css">
div#logo{padding:0.3em;}
/* */
body{font-family:Arial;font-size:0.8em;margin:0em;}
h2{padding:0.3em;color:#fff;font-weight:bold;background- color:#006699;font- size:1.1em;margin:0em;padding-left:0.3em;}
h2 a{color:#fff;text-decoration:none;padding:0.3em;padding-left:0em;width:100%;}
/* */
div.content{padding:0.4em;}
div.menu{padding:0.3em;padding-left:0em;}
/* */
div.user{background-color: #D7E4F0;padding:0.5em;margin-bottom:0.5em;}
/* */
div.noticeContainer{padding-top:0.1em;}
div.success{background-color:#54b067;}
div.error{background-color:#aa4444;}
div.info{background-color:#ff9900;}
div.notice{padding:0.5em;color:#fff;font-weight:bold;}
div.notice a{color:#fff;text-decoration:none;}
/* */
div.search_results{margin-bottom:1em;}
div.search_results h4{margin-bottom:0em;}
/* */
div.listItem{border-bottom:dotted 1px #ccc;padding:0.5em;padding-left:0em;padding- right:0em;}
div.listItem a.subject{font-size:1.2em;}
div.listItem div.unread{font-weight:bold;}
span.date{color:green;}
/* */
div.headers{padding-top:1em;padding-bottom:1em;}
div.headers label{font-weight:bold;}
div.messageBodyContainer{padding-top:1em;padding-bottom:1em;}
div.message{border-left:solid 3px #eee;padding-left:0.5em;padding-right:0.5em;}
div.messageTruncated{background-color:#eee;padding:0.5em;}
/* */
.background{background-color:#f0f0f0;padding:0.3em;}
/* */
form#compose label.block{display:block;}
/* */
.copy {padding-top: 1em;color: #aaa;}
</style>
</head>
<body>
<div id="logo">
<"/authentication?next_webapp_name=hushmail5&next_webapp_url_name=m&skin=mobile">
branding/hushmailcom/image/logo_small" border="0"/></a>
</div>
<h2>Sign in</h2>
<div class="content">
<div class="noticeContainer" id="authenticationform_hush_username"
style="display:
none;padding: ;width: ">
</div>
<div class="noticeContainer" id="authenticationform_hush_passphrase"
style="display:
none;padding: ;width: ">
</div>
<div class="noticeContainer" id="authenticationform_hush_remember_me"
style="display:
none;padding: ;width: ">
</div>
<form name="authenticationform" id="authenticationform"
action="/authentication/login?skin=mobile&next_webapp_name=hushmail5& amp;next_webapp_url_name=m" method="post">
<input type="hidden" name="form_token" value="a476281f4d85"/>
<input type="hidden" name="next_webapp_page" value="folder/INBOX/1"/>
<p><label for="hush_username">Email address:</label><br/>
<input type="email" name="hush_username" id="hush_username" value="benjuuuhvvihushmailcom"/></p>
<p><label for="hush_passphrase">Passphrase:</label><br/>
<input type="password" name="hush_passphrase" id="hush_passphrase" maxlength="1000" value=""/></p>
<p><input type="checkbox" name="hush_remember_me" id="hush_remember_me" value="on"
/><label for="hush_remember_me">Stay signed in when I close my browser</label></p>
<p><input type="submit" value="Sign In"/></p>
<input type="hidden" name="hush_customerid" value="0000000000000000"/>
</form>
<p><a href="/m/about" title="About">About</a></p>
<p>To learn more about Hushmail, please visit <wwwhushmailcom/" title="Hushmail - Free Email with Privacy"
>wushmailc/</a> on your computer.</p>
</div>
<!--
-->
<div class="content copy">
© 2008-2010 Hush Communications Ltd.
</div>
';
$preg_string = '%<label>From:</label>(.*)<br>%' ;
preg_match($preg_string, $email_saved_page, $res);
$email_from = $res[1];
echo $email_from ;
?>
</blink>
I've been trying the below script (within a larger app I'm working on) for hours now and I just can't understand what the problem is, no matter what I get "Notice: Undefined offset: 1" meaning that its having some problem putting the result into an array from the preg_match... I did a process that was nearly identical to a similar page earlier and it worked fine.. I would greatly appreciate any advice as I just don't know what to do at this point as I've already spent hours trying to troubleshoot this, I don't have tons of regex experience but I have used it a fair amount and I just can't figure out what could be preventing this from working correctly.
<blink>
<?PHP
$email_saved_page = '
<meta name="viewport" content="width=device-width"/>
<title>Sign in to Hushmail Mobile</title>
<style type="text/css">
div#logo{padding:0.3em;}
/* */
body{font-family:Arial;font-size:0.8em;margin:0em;}
h2{padding:0.3em;color:#fff;font-weight:bold;background- color:#006699;font- size:1.1em;margin:0em;padding-left:0.3em;}
h2 a{color:#fff;text-decoration:none;padding:0.3em;padding-left:0em;width:100%;}
/* */
div.content{padding:0.4em;}
div.menu{padding:0.3em;padding-left:0em;}
/* */
div.user{background-color: #D7E4F0;padding:0.5em;margin-bottom:0.5em;}
/* */
div.noticeContainer{padding-top:0.1em;}
div.success{background-color:#54b067;}
div.error{background-color:#aa4444;}
div.info{background-color:#ff9900;}
div.notice{padding:0.5em;color:#fff;font-weight:bold;}
div.notice a{color:#fff;text-decoration:none;}
/* */
div.search_results{margin-bottom:1em;}
div.search_results h4{margin-bottom:0em;}
/* */
div.listItem{border-bottom:dotted 1px #ccc;padding:0.5em;padding-left:0em;padding- right:0em;}
div.listItem a.subject{font-size:1.2em;}
div.listItem div.unread{font-weight:bold;}
span.date{color:green;}
/* */
div.headers{padding-top:1em;padding-bottom:1em;}
div.headers label{font-weight:bold;}
div.messageBodyContainer{padding-top:1em;padding-bottom:1em;}
div.message{border-left:solid 3px #eee;padding-left:0.5em;padding-right:0.5em;}
div.messageTruncated{background-color:#eee;padding:0.5em;}
/* */
.background{background-color:#f0f0f0;padding:0.3em;}
/* */
form#compose label.block{display:block;}
/* */
.copy {padding-top: 1em;color: #aaa;}
</style>
</head>
<body>
<div id="logo">
<"/authentication?next_webapp_name=hushmail5&next_webapp_url_name=m&skin=mobile">
branding/hushmailcom/image/logo_small" border="0"/></a>
</div>
<h2>Sign in</h2>
<div class="content">
<div class="noticeContainer" id="authenticationform_hush_username"
style="display:
none;padding: ;width: ">
</div>
<div class="noticeContainer" id="authenticationform_hush_passphrase"
style="display:
none;padding: ;width: ">
</div>
<div class="noticeContainer" id="authenticationform_hush_remember_me"
style="display:
none;padding: ;width: ">
</div>
<form name="authenticationform" id="authenticationform"
action="/authentication/login?skin=mobile&next_webapp_name=hushmail5& amp;next_webapp_url_name=m" method="post">
<input type="hidden" name="form_token" value="a476281f4d85"/>
<input type="hidden" name="next_webapp_page" value="folder/INBOX/1"/>
<p><label for="hush_username">Email address:</label><br/>
<input type="email" name="hush_username" id="hush_username" value="benjuuuhvvihushmailcom"/></p>
<p><label for="hush_passphrase">Passphrase:</label><br/>
<input type="password" name="hush_passphrase" id="hush_passphrase" maxlength="1000" value=""/></p>
<p><input type="checkbox" name="hush_remember_me" id="hush_remember_me" value="on"
/><label for="hush_remember_me">Stay signed in when I close my browser</label></p>
<p><input type="submit" value="Sign In"/></p>
<input type="hidden" name="hush_customerid" value="0000000000000000"/>
</form>
<p><a href="/m/about" title="About">About</a></p>
<p>To learn more about Hushmail, please visit <wwwhushmailcom/" title="Hushmail - Free Email with Privacy"
>wushmailc/</a> on your computer.</p>
</div>
<!--
-->
<div class="content copy">
© 2008-2010 Hush Communications Ltd.
</div>
';
$preg_string = '%<label>From:</label>(.*)<br>%' ;
preg_match($preg_string, $email_saved_page, $res);
$email_from = $res[1];
echo $email_from ;
?>
</blink>
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评论（2）
将
br部分更改为如下所示：Change the
brpart to something like this:<br ?/?>你的模式似乎是多线的，不是吗？所以我想你也必须使用 m 修饰符将正则表达式设置为多行（请参阅 此处）。只需在第二个 % 字符后添加“m”即可。
your pattern seems to be multiline, isn't it? So you have to set your regexp as multiline too I guess, using the m modifier (see here). Just add 'm' after your second % character.