如何非贪婪地进行多个后向匹配

发布于 2024-07-30 08:49:16 字数 686 浏览 7 评论 0原文

Source:    <prefix><content1><suffix1><prefix><content2><suffix2>
Engine:    PCRE

RegEx1:    (?<=<prefix>)(.*)(?=<suffix1>)
RegEx2:    (?<=<prefix>)(.*)(?=<suffix2>)

Result1:   <content1>
Result2:   <content1><suffix1><prefix><content2>

RegEx2 所需的结果只是但它显然是贪婪的。如何使 RegEx2 非贪婪并仅使用最后一个匹配的lookbehind？

[我希望我已经从 NoteTab 语法正确翻译了这个。我不做很多正则表达式编码。 <前缀>、<内容> & <后缀> 术语只是用来表示任意字符串。只有“<” 在“？<=lookbehind命令中很重要。]

我怀疑这很简单，但经过太多小时的搜索后我发现放弃自己解决。

帮助

感谢艺术的

原文

Source:    <prefix><content1><suffix1><prefix><content2><suffix2>
Engine:    PCRE

RegEx1:    (?<=<prefix>)(.*)(?=<suffix1>)
RegEx2:    (?<=<prefix>)(.*)(?=<suffix2>)

Result1:   <content1>
Result2:   <content1><suffix1><prefix><content2>

The desired result for RegEx2 is just <content2> but it is obviously greedy.
How do I make RegEx2 non-greedy and use only the last matching lookbehind?

[I hope I have translated this correctly from the NoteTab syntax. I don't do
much RegEx coding. The <prefix>, <content> & <suffix> terms are just meant to represent arbitrary strings. Only the "<" in the "?<=" lookbehind command is significant.]

I suspect it is something simple but after too many hours of searching I'm
giving up on solving it myself.

Thanks for the help

Art

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好多鱼好多余 2024-08-06 08:49:16

我建议您使用：

(?<=<prefix>)(((?!<prefix>).)*)(?=<suffix2>)

这可以确保匹配中没有。完整的匹配结果将是

I suggest you use:

(?<=<prefix>)(((?!<prefix>).)*)(?=<suffix2>)

This makes sure that there can be no <prefix> inside the match. The complete match result will be <content2>

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神回复 2024-08-06 08:49:16

前面放个贪心的东西？

(?:.*)(?<=<prefix>)(.*)(?=<suffix2>)

由于贪婪的 (?:.*) 将尽可能多地吞噬，因此只有最小值才会与模式的其余部分匹配 - 有效地使其余部分变得非贪婪。

非贪婪的 .*? 也可能有效：

(?<=<prefix>)(.*?)(?=<suffix2>)

Put something greedy in front of it?

(?:.*)(?<=<prefix>)(.*)(?=<suffix2>)

Since the greedy (?:.*) will gobble as much as it can, only the minimum will be matched by the rest of the pattern - effectively making the rest non-greedy.

The non-greedy .*? might also work:

(?<=<prefix>)(.*?)(?=<suffix2>)

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始终不够 2024-08-06 08:49:16

我刚刚遇到了同样的问题。但就我而言，

(?<=<prefix>)(?:.(?!<prefix>))*(?=<suffix>)

这就是我想要的。

此表达式将匹配和之间的任何字符串联，并且不包含子字符串 < /代码>。（我想是的。我不太擅长正则表达式。）

I just had the same problem. But in my case it was

(?<=<prefix>)(?:.(?!<prefix>))*(?=<suffix>)

That did what I wanted.

This expression will match anything that is a concatenation of characters between <prefix> and <suffix> and doesn't contain the substring <prefix>. (I think so. I'm not very good at regexp.)

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