懒惰（ungreedy）使用正则表达式匹配多个组 [英] Lazy (ungreedy) matching multiple groups using regex

问题描述

我想获取< tag>< / tag> 标记对之间的任何值的内容。

I would like to grab the contents of any value between pairs of <tag></tag> tags.

<tag>
This is one block of text
</tag>

<tag>
This is another one
</tag>

我想出的正则表达式是

/< tag>（。*）< / tag> / m

虽然它出现了要贪婪并且在最后的< / tag> 中捕获括号内的所有内容。我希望它尽可能地懒惰，以便每当它看到一个结束标记时，它会将其视为一个匹配组并重新开始。

Though, it appears to be greedy and is capturing everything within the enclosed parentheses up until the very last </tag>. I would like it to be as lazy as possible so that everytime it sees a closing tag, it will treat that as a match group and start over.

我怎么写正则表达式，以便我能够在给定的场景中获得多个匹配？

How can I write the regex so that I will be able to get multiple matches in the given scenario?

我在下面的链接中包含了我所描述的样本

I have included a sample of what I am describing in the following link

http://rubular.com/r/JW5M3rnqIE

注意：这不是XML，也不是基于任何现有的标准格式。我不需要任何复杂的东西，比如一个带有一个很好的解析器的完整库。

Note: This is not XML, nor is it really based on any existing standard format. I won't need anything sophisticated like a full-fledged library that comes with a nice parser.

推荐答案

使用正则表达式模式：

Go with regex pattern:

/<tag>(.*?)<\/tag>/im

懒惰（非贪婪）是。*？，而不是。* 。

Lazy (non-greedy) is .*?, not .*.

要查找多次出现，请使用：

To find multiple occurrences, use:

string.scan(/<tag>(.*?)<\/tag>/im) 

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