使用$ 0来引用Javascript的String.replace中的整个匹配 [英] Using $0 to refer to entire match in Javascript's String.replace

问题描述

我在一组文本中突出显示搜索字符串的实例。我想在替换查询的不区分大小写的匹配时保留原始文本的大小写。以下是我的开始：

I'm highlighting instances of a search string within a set of text. I want to preserve the case of the original text while replacing a case-insensitive match of the query. Here's what I started with:

text.replace(new RegExp('(' + query + ')', 'ig'), '<em>$1</em>');

在这种情况下，我需要转义查询防止括号打破子匹配，所以我想我会尝试：

In this case, I'd need to escape query to prevent parentheses from breaking the submatch, so I thought I'd try:

text.replace(new RegExp(query, 'ig'), '<em>$0</em>');

但 $ 0 似乎不是used - 所有匹配的字符串都替换为$ 0。但我确实找到了另一种方法：

But $0 doesn't seem to be used - all matched strings are replaced with $0. I did find an alternative, however:

text.replace(new RegExp(query, 'ig'), function(match) { return '<em>' + match + '</em>'; });

尽管如此，我不是很喜欢它的外观。您如何建议进行此类字符串替换？

I'm not a huge fan of how this looks, though. How would you recommend doing this type of string replacement?

推荐答案

使用 $& 而不是 $ 0 来引用整场比赛。我责备Perl。

Use $& and not $0 to refer to the entire match. I blame Perl.

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