正则表达式只匹配整个单词 [英] Regex match entire words only

问题描述

我有一个正则表达式，我用它来查找给定内容块中的所有单词，不区分大小写，包含在存储在数据库中的词汇表中.这是我的模式:

I have a regex expression that I'm using to find all the words in a given block of content, case insensitive, that are contained in a glossary stored in a database. Here's my pattern:

/($word)/i

问题是，如果我使用 /(Foo)/i 那么像 Food 这样的词会被匹配.单词两侧需要有空格或单词边界.

The problem is, if I use /(Foo)/i then words like Food get matched. There needs to be whitespace or a word boundary on both sides of the word.

如果Foo 是句首、句中或句尾的词，我如何修改表达式以仅匹配该词?

How can I modify my expression to match only the word Foo when it is a word at the beginning, middle, or end of a sentence?

推荐答案

使用单词边界:

/\b($word)\b/i

或者如果您正在搜索S.P.E.C.T.R.E."就像 Sinan Ünür 的例子:

Or if you're searching for "S.P.E.C.T.R.E." like in Sinan Ünür's example:

/(?:\W|^)(\Q$word\E)(?:\W|$)/i

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