正则表达式和xpath查询 [英] regular expressions and xpath query
问题描述
我有以下代码：
<？php
$ doc = new DOMDocument;
$ doc-> loadhtml（'< html>
< head>
< title>栏，这是一个例子< / title>
< / head> ;
< body>
< h1>最新消息< / h1>
foo< strong> bar< / strong>
< i> foobar< / i>
< / body>
< / html>'）;
$ xpath = new DOMXPath（$ doc）;
foreach（$ xpath-> query（'// * [contains（child :: text（），bar）]'）as $ e）{
echo $ e-> tagName ，\\\
;
$ / code> 打印
title
strong
i
这段代码找到包含单词bar的任何HTML元素，并且它与具有bar的单词匹配，如foobar我想更改查询以仅匹配单词bar，而没有任何前缀或后缀
我认为可以通过更改查询来搜索每个酒吧，该酒吧之前或之前没有收到一封信或者在之前或之后有一个空格
感谢
如果您正在寻找XPath 1.0的bar，那么您将不得不使用函数，XPath 1.0中没有正则表达式。
$ xpath-> query（// * [
starts-with（。，'bar'）or
contains（。 ，'bar'）或
（'bar'= substring（。，string-length（。） - string-length（'bar'）+ 1））
]）;
基本上这是说找到开头的字符串'bar'或包含'bar'（注意前后的空格）或结尾 - 'bar '（注意，结尾是一个XPath 2.0函数，所以我用前面的> Stackoverflow Answer 。） code>one bar，over或This bar。That bar。 C $ C> '酒吧'。你可以尝试这个包含，而不是：
contains（translate（。， '。，[]'，''），'bar'）或
c $ c>'。，[]'为一个 I have the following code Prints this code finds any HTML element that contains the word "bar" and it matches words that has "bar" like "foobar" I want to change the query to match only the word "bar" without any prefix or postfix I think it can be solved by changing the query to search for every "bar" that has not got a letter after or before or has a space after or before this code from a past question here by VolkerK Thanks If you are looking for just "bar" with XPath 1.0 then you'll have to use a combo of functions, there are no regular expressions in XPath 1.0. Basically this is saying locate strings that if the contains ' bar ' is not enough, because you may have That translates any 这篇关于正则表达式和xpath查询的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！''（单个空格）... so one在>变成单杠超过，因此会匹配bar如预期的那样。 <?php
$doc = new DOMDocument;
$doc->loadhtml('<html>
<head>
<title>bar , this is an example</title>
</head>
<body>
<h1>latest news</h1>
foo <strong>bar</strong>
<i>foobar</i>
</body>
</html>');
$xpath = new DOMXPath($doc);
foreach($xpath->query('//*[contains(child::text(),"bar")]') as $e) {
echo $e->tagName, "\n";
}
title
strong
i
$xpath->query("//*[
starts-with(., 'bar') or
contains(., ' bar ') or
('bar' = substring(.,string-length(.)-string-length('bar')+1))
]");
start-with 'bar' or contains ' bar ' (notice the spaces before and after) or ends-with 'bar' (notice that ends-with is an XPath 2.0 function, so I substituted code which emulates that function from a previous Stackoverflow Answer.) "one bar, over" or "This bar. That bar." where you may have other punctuation after the 'bar'. You could try this contains instead:contains(translate(., '.,[]', ' '), ' bar ') or
'.,[]' to a ' ' (single space)... so "one bar, over" becomes "one bar over", thus would match " bar " as expected.
