Question

提供以下字符串...

"Here is my very _special string_ with {different} types of _delimiters_ that might even {repeat a few times}."

...如何使用2个定界符（“ _”，“ {和}”）将其拆分为数组，又如何将定界符保留在数组的每个元素中？

目标是：

[
  "Here is my very ", 
  "_special string_", 
  " with ", 
  "{different}", 
  " types of ", 
  "_delimiters_", 
  "that might even ", 
  "{repeat a few times}", 
  "."
]

我最好的选择是：

let myText = "Here is my very _special string_ with {different} types of _delimiters_ that might even {repeat a few times}."

console.log(myText.split(/(?=_|{|})/g))

如您所见，它无法复制所需的数组。

Answer 1

您可以使用

s.split(/(_[^_]*_|{[^{}]*})/).filter(Boolean)

请参见regex demo。整个模式包含在一个捕获组中，因此所有匹配的子字符串都包含在String#split之后的结果数组中。

正则表达式详细信息

(_[^_]*_|{[^{}]*})-捕获组1：
- _[^_]*_-_，除了_以外的0个或更多字符，然后是_
- |-或
- {[^{}]*}-一个{，然后是{和}之外的0个或多个字符，然后是}

请参阅JS演示

var s = "Here is my very _special string_ with {different} types of _delimiters_ that might even {repeat a few times}.";
console.log(s.split(/(_[^_]*_|{[^{}]*})/).filter(Boolean));

Answer 2

您可以使用以下正则表达式返回一些undefined值，最后可以过滤undefined值。

let myText = "Here is my very _special string_ with {different} types of _delimiters_ that might even {repeat a few times}."

console.log(myText.split(/(_.+?_)|({.+?})/g).filter(Boolean))

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Answer 3

您可以在以下正则表达式（使用filter(Boolean)）的（零宽度）匹配项上拆分字符串。

(?<= )(?=[_{])|(?<=[_}])(?=\W)

请注意，此正则表达式不包含捕获组。

Demo

Javascript的正则表达式引擎执行以下操作。

(?<= )     preceding character is a space         (positive lookbehind)
(?=[_{])   following character is '_' or '{'      (positive lookahead) 
|          or 
(?<=[_}])  preceding character is '_' or '}'      (positive lookbehind)
(?=\W)     following character is a non-word char (positive lookahead)

(?=\W)可能例如与空格或标点符号匹配。

我假设括号和下划线不是嵌套的（例如，字符串将不包含_a {b} c_或{a _b_ c}）。

Answer 4

我不喜欢正则表达式，因为我不理解这种东西。 ?

所以我的解决方案是用#_替换blank_，依此类推，然后用＃分割。

在2个定界符之间分割字符串并将其包括在内

4 个答案: