java 正则表达式不带空格分割数字和字母组
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Regex split numbers and letter groups without spaces
提问by Steve C
If I have a string like "11E12C108N" which is a concatenation of letter groups and digit groups, how do I split them without a delimiter space character inbetween?
如果我有一个像“11E12C108N”这样的字符串，它是字母组和数字组的串联，我如何在没有分隔符空格字符的情况下拆分它们？
For example, I want the resulting split to be:
例如，我希望结果拆分为：
tokens[0] = "11"
tokens[1] = "E"
tokens[2] = "12"
tokens[3] = "C"
tokens[4] = "108"
tokens[5] = "N"
I have this right now.
我现在有这个。
public static void main(String[] args) {
String stringToSplit = "11E12C108N";
Pattern pattern = Pattern.compile("\d+\D+");
Matcher matcher = pattern.matcher(stringToSplit);
while (matcher.find()) {
System.out.println(matcher.group());
}
}
Which gives me:
这给了我：
11E
12C
108N
Can I make the original regex do a complete split in one go? Instead of having to run the regex again on the intermediate tokens?
我可以让原始正则表达式一次性完成完整拆分吗？而不是必须在中间令牌上再次运行正则表达式？
回答by Kendall Frey
Use the following regex, and get a list of all matches. That will be what you are looking for.
使用以下正则表达式，并获取所有匹配项的列表。那将是你正在寻找的。
\d+|\D+
In Java, I think the code would look something like this:
在 Java 中，我认为代码如下所示：
Matcher matcher = Pattern.compile("\d+|\D+").matcher(theString);
while (matcher.find())
{
// append matcher.group() to your list
}
回答by Pshemo
You can also use "look around" in split regex
您还可以在拆分正则表达式中使用“环顾四周”
String stringToSplit = "11E12C108N";
String[] tokens = stringToSplit .split("(?<=\d)(?=\D)|(?=\d)(?<=\D)");
System.out.println(Arrays.toString(tokens));
out
[11, E, 12, C, 108, N]
出去
[11, E, 12, C, 108, N]
Idea is to split in places which are between digit (\d) and non-digit (\D). In other words it is place (empty string) which have:
想法是在数字（\d）和非数字（\D）之间的位置拆分。换句话说，它是具有以下特性的地方（空字符串）：
- digit before
(?<=\d)and non-digit after it(?=\D) - non-digit before
(?<=\D)and digit after it(?=\d)
- 前面
(?<=\d)的数字和后面的非数字(?=\D) - 非数字之前
(?<=\D)和之后的数字(?=\d)
More info about (?<=..)and (?=..)(and few more) you can find at http://www.regular-expressions.info/lookaround.html
有关(?<=..)和(?=..)（以及更多）的更多信息，您可以在http://www.regular-expressions.info/lookaround.html 上找到
