正则表达式从字符串中提取前 3 个单词 [英] Regex to extract first 3 words from a string

问题描述

我正在尝试替换字符串中除前 3 个单词以外的所有单词(使用 textpad).

I am trying to replace all the words except the first 3 words from the String (using textpad).

Ex 值:这是用于测试的字符串.

Ex value: This is the string for testing.

我只想提取 3 个单词:This is the 从上面的字符串中删除所有其他单词.

I want to extract just 3 words: This is the from above string and remove all other words.

我找到了匹配 3 个单词的正则表达式 (\w+\s+){3} 但我需要匹配除前 3 个单词之外的所有其他单词和删除其他词.有人可以帮我吗?

I figured out the regex to match the 3 words (\w+\s+){3} but I need to match all other words except the first 3 words and remove other words. Can someone help me with it?

推荐答案

具体如何取决于风味，但要消除除前三个词之外的所有内容，您可以使用:

Exactly how depends on the flavor, but to eliminate everything except the first three words, you can use:

^((?:\S+\s+){2}\S+).*

将前三个单词捕获到捕获组 1 中，以及字符串的其余部分.对于替换字符串，您使用对捕获组 1 的引用.在 C# 中，它可能如下所示:

which captures the first three words into capturing group 1, as well as the rest of the string. For your replace string, you use a reference to capturing group 1. In C# it might look like:

resultString = Regex.Replace(subjectString, @"^((?:\S+\s+){2}\S+).*", "${1}", RegexOptions.Multiline);

这篇关于正则表达式从字符串中提取前 3 个单词的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！