java - 在多个字符上拆分字符串

Question

我想根据众多字符(如下所列)之一拆分句子。我的正则表达式能够根据大多数字符进行拆分，但不能根据“[”、“]”(左方括号和右方括号)进行拆分。如果我将字符串 SPECIAL_CHARACTERS_REGEX 更改为 [ :;'=\\()!-\\[\\]]，它会开始拆分字符串中的整数，而不是拆分方括号。如何使正则表达式拆分为方括号而不是整数('[]' 表示所有整数)。

另一个相关问题，有没有办法也从字符串中拆分数字？例如。 9pm 应拆分为 9 和 pm。

This:

private static final String SPECIAL_CHARACTERS_REGEX = "[ :;'=\\()!-]";
String rawMessage = "let's meet tomorrow at 9:30p? 7-8pm? i=you go (no Go!) [to do !]"
String[] tokens = rawMessage.split(SPECIAL_CHARACTERS_REGEX);

Gives:

Input: let's meet tomorrow at 9:30p? 7-8pm? i=you go (no Go!) [to do !]
output: [let, s, meet, tomorrow, at, 9, 30p?, 7, 8pm?, i, you, go, , no, Go, , , [to, do, , ]]

还有，

This:

private static final String SPECIAL_CHARACTERS_REGEX = "[ :;'=\\()!-\\[\\]]";
String rawMessage = "let's meet tomorrow at 9:30p? 7-8pm? i=you go (no Go!) [to do !]"
String[] tokens = rawMessage.split(SPECIAL_CHARACTERS_REGEX);

Gives:
let's meet tomorrow at 9:30p? 7-8pm? i=you go (no Go!) [to do !]
[let, s, meet, tomorrow, at, , , , , p, , , , , pm, , i, you, go, , no, , o, , , , to, do]

预期输出:

{"let", "s", "meet", "tomorrow", "at", "9", "30", "p", "7", "8", "pm", "i", "you", "go", "no", "Go", "to", "do"}

Answer 1

如果你把破折号留在字符类的中间，你也需要转义它。

但是，通过将它放在字符类的开头或结尾来避免这种情况。此外，您不需要在此处转义 ()，并且您可能希望在字符类之后使用量词 * 或 + .

更新:要获得预期结果，您可以这样做。

private static final String SPECIAL_CHARACTERS_REGEX = "[ :;'?=()!\\[\\]-]+|(?<=\\d)(?=\\D)";
String rawMessage = "let's meet tomorrow at 9:30p? 7-8pm? i=you go (no Go!) [to do !]";
String[] tokens = rawMessage.split(SPECIAL_CHARACTERS_REGEX);
System.out.println(Arrays.toString(tokens));

正则表达式:

[ :;'?=()!\[\]-]+    any character of: ' ', ':', ';', ''', '?',
                       '=', '(', ')', '!', '\[', '\]', '-' (1 or more times)
 |                   OR
  (?<=               look behind to see if there is:
   \d                digits (0-9)
  )                  end of look-behind
   (?=               look ahead to see if there is:
    \D               non-digits (all but 0-9)
   )                 end of look-ahead

参见 Working demo

输出

[let, s, meet, tomorrow, at, 9, 30, p, 7, 8, pm, i, you, go, no, Go, to, do]