正则表达式字边界替代 [英] Regex word boundary alternative

问题描述

我使用的是标准的 \b 字边界.但是，它并没有像我想要的那样处理点 (.) 字符.

所以下面的正则表达式:

\b(\w+)\b

将匹配 cats.dog 中的 cats 和 dogs 如果我有一个字符串表示 cats and dogs don't make猫.狗.

我需要一个词边界替代方案，仅在以下情况下才匹配整个词:

1. 它不包含点(.)字符
2. 每边至少用一个空格( )字符封装

有什么想法吗?！

附言我需要这个用于 PHP

解决方案

你可以尝试使用 (?<=\s) before 和 (?=\s)> after 代替 \b 以确保它前后有一个空格，但是您可能还希望允许使用 位于字符串的开头或结尾>(?<=\s|^) 和 (?=\s|$)

这将自动排除带有 . 的单词"，但它也会排除句尾的单词，因为它和句号之间没有空格.

I was using the standard \b word boundary. However, it doesn't quite deal with the dot (.) character the way I want it to.

So the following regex:

\b(\w+)\b

will match cats and dogs in cats.dog if I have a string that says cats and dogs don't make cats.dogs.

I need a word boundary alternative that will match a whole word only if:

1. it does not contain the dot(.) character
2. it is encapsulated by at least one space( ) character on each side

Any ideas?!

P.S. I need this for PHP

解决方案

You could try using (?<=\s) before and (?=\s) after in place of the \b to ensure that there is a space before and after it, however you might want to also allow for the possibility of being at the start or end of the string with (?<=\s|^) and (?=\s|$)

This will automatically exclude "words" with a . in them, but it would also exclude a word at the end of a sentence since there is no space between it and the full stop.

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