javascript 使用 RegEx 在段落标记之间提取文本
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Extract text between paragraph tag using RegEx
提问by tonymx227
I try to extract text between parapgraph tag using RegExp in javascript. But it doen't work...
我尝试在 JavaScript 中使用 RegExp 提取段落标记之间的文本。但它不起作用...
My pattern:
我的模式：
<p>(.*?)</p>
Subject:
主题：
<p> My content. </p> <img src="https://encrypted-tbn3.gstatic.com/images?q=tbn:ANd9GcTJ9ylGJ4SDyl49VGh9Q9an2vruuMip-VIIEG38DgGM3GvxEi_H"> <p> Second sentence. </p>
Result :
结果 ：
My content
What I want:
我想要的是：
My content. Second sentence.
回答by Explosion Pills
There is no "capture all group matches" (analogous to PHP's preg_match_all) in JavaScript, but you can cheat by using .replace:
preg_match_allJavaScript 中没有“捕获所有组匹配”（类似于 PHP 的），但您可以使用.replace以下方法作弊：
var matches = [];
html.replace(/<p>(.*?)<\/p>/g, function () {
//arguments[0] is the entire match
matches.push(arguments[1]);
});
回答by MikeM
To get more than one match of a pattern the global flag gis added.
The matchmethod ignores capture groups ()when matching globally, but the execmethod does not. See MDN exec.
要获得一个模式的多个匹配项，需要g添加全局标志。
该match方法()在全局匹配时会忽略捕获组，但该exec方法不会。参见MDN 执行。
var m,
rex = /<p>(.*?)<\/p>/g,
str = '<p> My content. </p> <img src="https://encrypted-tbn3.gstatic.com/images?q=tbn:ANd9GcTJ9ylGJ4SDyl49VGh9Q9an2vruuMip-VIIEG38DgGM3GvxEi_H"> <p> Second sentence. </p>';
while ( ( m = rex.exec( str ) ) != null ) {
console.log( m[1] );
}
// My content.
// Second sentence.
If there may be newlines between the paragraphs, use [\s\S], meaning match any space or non-space character, instead of ..
如果段落之间可能有换行符，请使用[\s\S]，意思是匹配任何空格或非空格字符，而不是.。
Note that this kind of regex will fail on nested paragraphs as it will match up to the first closing tag.
请注意，这种正则表达式将在嵌套段落上失败，因为它将匹配第一个结束标记。
