javascript - 在 JavaScript 中由一个字符而不是连续的字符分割

Question

情况如下：

var stringExample = "hello=goodbye==hello";
var parts = stringExample.split("=");

输出：

hello,goodbye,,hello

我需要这个输出：

hello,goodbye==hello

连续/重复的字符必须忽略，只取单个"="来拆分。

也许一些正则表达式？

Answer 1

您可以使用正则表达式：

var parts = stringExample.split(/\b=\b/);

\b检查单词边界。

Answer 2

Most probably, @dystroys answer is the one you're looking for. But if any characters other than alphanumerics (A-Z, a-z, 0-9 or _) could surround a "splitting ="), then his solution won't work. For example, the string

It's=risqué=to=use =Unicode!=See?

would be split into

"It's", "risqué=to", "use Unicode!=See?"

So if you need to avoid that, you would normally use a lookbehind assertion:

result = subject.split(/(?<!=)=(?!=)/);  // but that doesn't work in JavaScript!

So even though this would only split on single =s, you can't use it because JavaScript doesn't support the (?<!...) lookbehind assertion.

Fortunately, you can always transform a split() operation into a global match() operation by matching everything that's allowed between delimiters:

result = subject.match(/(?:={2,}|[^=])*/g);

will give you

"It's", "risqué", "to", "use ", "Unicode!", "See?"

Answer 3

作为可能的解决方案的第一个近似值可能是：

".*[^=]=[^=].*"

请注意，这只是正则表达式，如果您想将它与 egrep、sed、java 正则表达式或其他任何东西一起使用，请注意是否需要转义某些内容。

注意！：这是第一个近似值，可以改进。请注意，例如，此正则表达式不会匹配此字符串“=”（null - equal - null）。