正则表达式，选择最接近的匹配 [英] Regex, select closest match

问题描述

假设以下单词序列

BLA text text text  text text text BLA text text text text LOOK text text text BLA text text BLA

我想做的是从 BLA 中提取文本到 LOOK，但最接近的 BLA.IE.我想得到

What I would like to do is to extract the text from BLA to LOOK, but the BLA which is the closest to look. I.e. I would like to get

BLA text text text text LOOK 

我应该如何使用正则表达式做到这一点?我得到了一种有效的解决方案，但效率极低.

How should I do that using regular expressions? I got one solution which works, but which is exteremely inefficient.

BLA(?!.*?BLA.*?LOOK).*?LOOK

是否有更好、更高效的方法来实现匹配此模式?

Is there a better and more performant way to achieve matching this pattern?

我想做的是:我想匹配 BLA，然后前瞻，直到使用 LOOK 进行正向前瞻或使用 BLA 进行负向前瞻.但我不知道如何将其放入正则表达式中.

What I would like to do is: I would like to match BLA, then forward lookahead until either positive fordward lookahead with LOOK or negative lookahead with BLA. But I don't know a way to put this into a regular expression.

作为引擎，我在 python 中使用 re.

As a engine I use re in python.

推荐答案

(?s)BLA(?:(?!BLA).)*?LOOK

试试这个.请参阅演示.

或者，使用

BLA(?:(?!BLA|LOOK)[\s\S])*LOOK

为了更安全.

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