我想从HTML文档中获取所有链接，除了具有指定类名的链接，使用REGEX。
例如：
<a href="someSite" class="className">qwe</a> <a href="someSite">qwe</a>
因此，我希望链接中只有 href =“someSite”，而不包含等于“className”的类
我创建了正则表达式：
(?<=<\s*a.*)href\s*?=\s*?("|').*?("|')
返回exacly我想要的，但来自所有链接，我不知道如何向我的Regex添加一个异常，以便不重新启动指定类名的链接
任何帮助将不胜感激：）
答案 0 :(得分：2)
如果您愿意使用jQuery，则可以在不使用Regex的情况下执行此操作：
var list = $("a", document).filter(function () {
return $(this).hasClass("className") == false;
});
答案 1 :(得分：0)
假设你在某个变量中有HTML，你可以使用http://code.google.com/p/phpquery/wiki/Selectors（phpquery - php的php jQuery-esq）。
答案 2 :(得分：0)
其他答案是明智的。但如果出于任何原因你坚持使用REGEX方法。试试这个。
我假设您正在通过PHP（或.NET）进行REGEX，因为您的模式包含一个负面的后置断言，这在JavaScript中不受支持。
我还将匹配与过滤掉那些带有错误类的匹配，因为REGEX对后者来说并不理想（因为class属性可能出现在链接开始标记内的任何一点）。
$str = "<a href='bad_href' class='badClass'>bad link</a> <a href='good_href'>good link</a>";
preg_match_all('/<a.+(href ?= ?("|\')[^\2]*\2).*>.*<\/a>/U', $str, $matches);
foreach($matches[0] as $key => $match)
if (preg_match('/class=(\'|")[^\1]*badClass[^\1]*\1/', $match))
unset($matches[1][$key]);
$matches = $matches[1]; //array containing "href='good_href'"
答案 3 :(得分：0)
var aList= document.getElementsByTagName('a');
for (var i in aList) {
if (aList.hasOwnProperty(i)) {
if (aList[i].className.indexOf(YourClassName) != -1) continue;
//...
//... Your code
}
}
答案 4 :(得分：0)
正如其他人已经或已经指出的那样，使用正则表达式解析非常规语言充满了危险！最好使用专门为该作业设计的专用解析器，尤其是在解析HTML标签汤时。
如果您坚持使用正则表达式，那么这是一个经过测试的PHP脚本，它实现了一个“非常好”的正则表达式解决方案：
<?php // test.php Rev:20120626_2100
function strip_html_anchor_tags_not_having_class($text) {
$re_html_anchor_not_having_class ='% # Rev:20120626_1300
# Match an HTML 4.01 A element NOT having a specific class.
<a\b # Anchor element start tag open delimiter
(?: # Zero or more attributes before CLASS.
\s+ # Attributes are separated by whitespace.
(?!class\b) # Only non-CLASS attributes here.
[A-Za-z][\w\-:.]* # Attribute name is required.
(?: # Attribute value is optional.
\s*=\s* # Name and value separated by =
(?: # Group for value alternatives.
"[^"]*" # Either a double-quoted string,
| \'[^\']*\' # or a single-quoted string,
| [\w\-:.]+ # or a non-quoted string.
) # End group of value alternatives.
)? # Attribute value is optional.
)* # Zero or more attributes before CLASS.
(?: # Optional CLASS (but only if NOT MyClass).
\s+ # CLASS attribute is separated by whitespace.
class # (case insensitive) CLASS attribute name.
\s*=\s* # Name and value separated by =
(?: # Group allowable CLASS value alternatives.
(?-i) # Use case-sensitive match for CLASS value.
" # Either a double-quoted value...
(?: # Single-char-step through CLASS value.
(?! # Assert each position is NOT MyClass.
(?<=["\s]) # Preceded by opening quote or space.
MyClass # (case sensitive) CLASS value to NOT be matched.
(?=["\s]) # Followed by closing quote or space.
) # End assert each position is NOT MyClass.
[^"] # Safe to match next CLASS value char.
)* # Single-char-step through CLASS value.
" # Ok. DQ value does not contain MyClass.
| \' # Or a single-quoted value...
(?: # Single-char-step through CLASS value.
(?! # Assert each position is NOT MyClass.
(?<=[\'\s]) # Preceded by opening quote or space.
MyClass # (case sensitive) CLASS value to NOT be matched.
(?=[\'\s]) # Followed by closing quote or space.
) # End assert each position is NOT MyClass.
[^\'] # Safe to match next CLASS value char.
)* # Single-char-step through CLASS value.
\' # Ok. SQ value does not contain MyClass.
| # Or a non-quoted, non-MyClass value...
(?! # Assert this value is NOT MyClass.
MyClass # (case sensitive) CLASS value to NOT be matched.
) # Ok. NQ value is not MyClass.
[\w\-:.]+ # Safe to match non-quoted CLASS value.
) # End group of allowable CLASS values.
(?: # Zero or more attribs allowed after CLASS.
\s+ # Attributes are separated by whitespace.
[A-Za-z][\w\-:.]* # Attribute name is required.
(?: # Attribute value is optional.
\s*=\s* # Name and value separated by =
(?: # Group for value alternatives.
"[^"]*" # Either a double-quoted string,
| \'[^\']*\' # or a single-quoted string,
| [\w\-:.]+ # or a non-quoted string.
) # End group of value alternatives.
)? # Attribute value is optional.
)* # Zero or more attributes after CLASS.
)? # Optional CLASS (but only if NOT MyClass).
\s* # Optional whitespace before closing >
> # Anchor element start tag close delimiter
( # $1: Anchor element contents.
[^<]* # {normal*} Zero or more non-<
(?: # Begin {(special normal*)*} construct
< # {special} Allow a < but only if
(?!/?a\b) # not the start of the </a> close tag.
[^<]* # more {normal*} Zero or more non-<
)* # Finish {(special normal*)*} construct
) # End $1: Anchor element contents.
</a\s*> # A element close tag.
%ix';
// Remove all matching start and end tags but keep the element contents.
return preg_replace($re_html_anchor_not_having_class, '$1', $text);
}
$input = file_get_contents('testdata.html');
$output = strip_html_anchor_tags_not_having_class($input);
file_put_contents('testdata_out.html', $output);
?>
function strip_html_anchor_tags_not_having_class($text) 此函数剥离所有HTML 4.01 Anchor元素（即<A>标记）的开始和匹配结束标记，这些元素不具有包含以下内容的特定（区分大小写）CLASS属性值：{{ 1}}。 MyClass值可以包含任意数量的值，但其中一个值必须完全为：CLASS。 Anchor标记名称和CLASS属性名称不区分大小写匹配。
MyClass）：testdata.html<h2>Paragraph contains links to be preserved (CLASS has "MyClass"):</h2>
<p>
Single DQ matching CLASS: <a href="URL" class="MyClass">Test 01</a>.
Single SQ matching CLASS: <a href="URL" class='MyClass'>Test 02</a>.
Single NQ matching CLASS: <a href="URL" class=MyClass>Test 03</a>.
Variable whitespace: <a href = "URL" class = MyClass >Test 04</a>.
Variable capitalization: <A HREF = "URL" CLASS = "MyClass" >Test 04</A>.
Reversed attribute order: <a class="MyClass" href="URL">Test 05</a>
Class before MyClass: <a href="URL" class="Pre MyClass">Test 06</a>.
Class after MyClass: <a href="URL" class="MyClass Post">Test 07</a>.
Sandwiched MyClass: <a href="URL" class="Pre MyClass Post">Test 08</a>.
Link with HTML content: <a class="MyClass" href="URL"><b>Test</b> 09</a>.
</p>
<h2>Paragraph contains links to be stripped (NO CLASS with "MyClass"):</h2>
<p>
Case does not match: <a href="URL" class="myclass">TEST 10</a>.
CLASS not whole word: <a href="URL" class="NotMyClass">TEST 11</a>.
No class attribute: <a href="URL">TEST 12</a>.
Link with HTML content: <a class="NotMyClass" href="URL"><b>Test</b> 13</a>.
</p>
）：testdata_out.html希望提升正则表达式的读者可以很好地研究这个（相当长而复杂）的正则表达式。它精确地手工制作，既准确又快速，并实现了几种先进的效率技术。当然，它完全被评论为仅仅是人类的可读性。这个例子清楚地表明“常规表达式”已演变成一种丰富的（非 REGULAR ）编程语言。
请注意，此解决方案将始终存在边缘情况。例如CDATA部分，注释，脚本，样式和标记属性值中的邪恶字符串可能会使其失效。 （参见上面的免责声明。）也就是说，这个解决方案在许多情况下都会做得很好（但永远不会 100％可靠！）