如何使用 JavaScript 正则表达式提取字符串中的最后一个单词？
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How to extract the last word in a string with a JavaScript regex?
提问by ps0604
I need is the lastmatch. In the case below the word testwithout the $signs or any other special character:
我需要的是最后一场比赛。在下面test没有$符号或任何其他特殊字符的单词的情况下：
Test String:
测试字符串：
$this$ $is$ $a$ $test$
Regex:
正则表达式：
\b(\w+)\b
回答by six fingered man
The $represents the end of the string, so...
该$代表字符串的结尾，所以...
\b(\w+)$
However, your test string seems to have dollar sign delimiters, so if those are always there, then you can use that instead of \b.
但是，您的测试字符串似乎有美元符号分隔符，因此如果它们始终存在，那么您可以使用它而不是\b.
$(\w+)$$
var s = "$this$ $is$ $a$ $test$";
document.body.textContent = /$(\w+)$$/.exec(s)[1];If there could be trailing spaces, then add \s*before the end.
如果可能有尾随空格，则\s*在末尾添加。
$(\w+)$\s*$
And finally, if there could be other non-word stuff at the end, then use \W*instead.
最后，如果最后还有其他非单词的东西，那就用吧\W*。
\b(\w+)\W*$
回答by Maarten Peels
var input = "$this$ $is$ $a$ $test$";
var input = "$this$ $is$ $a$ $test$";
If you use var result = input.match("\b(\w+)\b")an array of all the matches will be returned next you can get it by using pop()on the result or by doing: result[result.length]
如果您使用var result = input.match("\b(\w+)\b")所有匹配项的数组，接下来将返回您可以通过pop()在结果上使用或执行以下操作来获取它：result[result.length]
回答by Jonathan Mee
Your regex will find a word, and since regexes operate left to right it will find the first word.
您的正则表达式会找到一个单词，并且由于正则表达式从左到右运行，它将找到第一个单词。
A \w+matches as many consecutive alphanumeric character as it can, but it must match at least 1.
A \bmatches an alphanumeric character next to a non-alphanumeric character. In your case this matches the '$'characters.
A\w+匹配尽可能多的连续字母数字字符，但它必须至少匹配 1 个
。A\b匹配非字母数字字符旁边的字母数字字符。在您的情况下，这与'$'字符匹配。
What you need is to anchor your regex to the end of the input which is denoted in a regex by the $character.
您需要的是将您的正则表达式锚定到输入的末尾，该输入在正则表达式中由$字符表示。
To support an input that may have more than just a '$'character at the end of the line, spaces or a period for instance, you can use \W+which matches as many non-alphanumeric characters as it can:
为了支持'$'在行尾可能不仅仅是一个字符、空格或句点的输入，您可以使用\W+which 匹配尽可能多的非字母数字字符：
$(\w+)\W+$
