英文:
A regular expression that matches 1-3:6-8:13-15 etc
问题
我有一个字符串模式，可以是：
- 一个数字（例如1）
- 一个数字范围（例如1-2）
- 一组数字（例如1:4:7）
- 一组范围（例如1-2:5-7:12-15）
所以，类似"1"、"1-4:4"、"6:9-12:20"的字符串都是有效的。
我已经在RegExr.com上创建了一个模式：
/(\d(-\d)?)(:(\d(-\d)?))?/g
这个模式几乎可以工作，但还不够，因为它无法匹配超过第一对的内容。例如：
1-2:7-9:12-23
^
箭头所示的字符由于某种原因没有匹配上。
有人可以提供建议吗？
英文:
I have a string pattern that can be
- a number (ex 1)
- a number range (ex 1-2)
- a list of numbers (ex 1:4:7)
- a list of ranges (ex 1-2:5-7:12-15)
So, string like "1", "1-4:4", "6:9-12:20" are all valid
I have created a pattern on RegExr.com so far
/(\d(-\d)?)(:(\d(-\d)?))?/g
which is almost working, but not quite, as it can't go past the first pair. For example:
1-2:7-9:12-23
^
the character denoted with the arrow is not matched for some reason.
Can someone please advise?
答案1
得分: 1
你可以尝试这个模式：/^(\d+(-\d+)?)(:(\d+(-\d+)?))*$/gm
这是你模式的修改版本，添加了起始/结束字符串锚点，将你最后一组的 ? 量词替换为 *（零次或多次），并使用 + 量词来匹配数字组。
在这里查看正则表达式演示。
英文:
You could try this pattern: /^(\d+(-\d+)?)(:(\d+(-\d+)?))*$/gm
This is modified version of your pattern, which added start/end string anchors, replaced ? quantifier of your last group to * (zero or more) quantifier, and + quantifier for matching group of digit numbers.
See regex demo here.
答案2
得分: 0
以下是代码部分的翻译：
public static void main(String[] args) {
String pattern = "(?:(?:^|:)(\\d+)(?:-(\\d+))?)+";
Stream.of(
"1",
"1-2.",
"1:4:7",
"1-2:5-7:12-15",
"1-4:4",
"6:9-12:20",
"123",
"123-234",
"123:456:789",
"123-234:567-789:1234-1567",
"123-456:456",
"678:999-1234:2012"
).forEach(it -> {
System.out.println(it + " => " + it.matches(pattern));
});
}
Stdout:
1 => true
1-2. => false
1:4:7 => true
1-2:5-7:12-15 => true
1-4:4 => true
6:9-12:20 => true
123 => true
123-234 => true
123:456:789 => true
123-234:567-789:1234-1567 => true
123-456:456 => true
678:999-1234:2012 => true
英文:
Each group could start from the beginning of the string or with ":": /^|:/. This way regex could be simplified into a single group definition:
public static void main(String[] args) {
String pattern = "(?:(?:^|:)(\\d+)(?:-(\\d+))?)+";
Stream.of(
"1",
"1-2.",
"1:4:7",
"1-2:5-7:12-15",
"1-4:4",
"6:9-12:20",
"123",
"123-234",
"123:456:789",
"123-234:567-789:1234-1567",
"123-456:456",
"678:999-1234:2012"
).forEach(it -> {
System.out.println(it + " => " + it.matches(pattern));
});
}
Stdout:
1 => true
1-2. => false
1:4:7 => true
1-2:5-7:12-15 => true
1-4:4 => true
6:9-12:20 => true
123 => true
123-234 => true
123:456:789 => true
123-234:567-789:1234-1567 => true
123-456:456 => true
678:999-1234:2012 => true
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