自然语言处理的正则表达式 "does not contain" 模式问题

Question

I am implementing a simple NLP algo. I have already implemented the solution looping over the raw string to assist the regex, but now I want to see if I can do it in pure regex.

我不知道如何让 'build' 小组尊重负面展望。我正在尝试捕获 [“自然语言处理”算法] 非常感谢任何帮助，谢谢

$subject_string = <<<'subject_string'
Projects I've built & Plan to build. HackMatch.io (May 2020 onward), 
As of October 2020, I intend to start implementing "Natural Language Processing" algorithms 
in PHP when I have time. I'll then use PHP to upload the results to big data tech (e.g. BigQuery) 
to create some data visualizations.
subject_string;

$pattern = <<<'pattern'
/\b(?'verb'build|make|implementing)
(?'build'.+?(?!build|make|implementing)) 
(?=\bin\b|\bon\b)
(?:build|make|implementing)??/ix
pattern;

preg_match_all($pattern, $subject_string, $matches)

Answer 1

您可以使用

/\b(?'verb'build|make|implementing)\s*
(?'build'(?:(?!(?&verb)).)*?) 
(?=\s*\b(?:in|on)\b)/ixs

参见regex demo。详情:

\b - 单词边界
(?'verb'build|make|implementing) - 组“动词”：括号内的单词之一
\s* - 零个或更多空格
(?'build'(?:(?!(?&verb)).)*?) - “构建”组：任何字符，零次或多次出现，但尽可能少，不启动“动词”组中定义的任何字符序列
\s* - 零个或更多空格
(?=\b(?:in|on)\b) - 正向前瞻匹配紧跟整个单词 in 或 on.

自然语言处理的正则表达式 "does not contain" 模式问题

Regex "does not contain" pattern issue for Natural Language Processing

php

regex

algorithm

pcre

artificial-intelligence