问题描述
我有一个 URL，我正在尝试将它与正则表达式匹配以拉出一些组.我遇到的问题是 URL 可以以 或 结尾，以/"和更多 URL 文本结尾.我想匹配这样的网址:
I have a URL, and I'm trying to match it to a regular expression to pull out some groups. The problem I'm having is that the URL can either end or continue with a "/" and more URL text. I'd like to match URLs like this:
但不匹配这样的东西:
所以，我认为我最好的选择是这样的:
So, I thought my best bet was something like this:
/(.+)/(\d{4}-\d{2}-\d{2})-(\d+)[/$]
末尾的字符类包含/"或行尾.不过，字符类似乎对其中的$"不满意.我怎样才能最好地区分这些 URL，同时仍然拉回正确的组?
where the character class at the end contained either the "/" or the end-of-line. The character class doesn't seem to be happy with the "$" in there though. How can I best discriminate between these URLs while still pulling back the correct groups?
推荐答案
/(.+)/(\d{4}-\d{2}-\d{2})-(\d+)(/.*)?$
第一捕获组(.+)
.+ 匹配任何字符(行终止符除外)
.+ matches any character (except for line terminators)
+量词 - one 和 unlimited 次之间的匹配，尽可能多次，返回需要(贪婪)
+Quantifier — Matches between one and unlimited times, as many times as possible, giving back as needed (greedy)
第二捕获组(\d{4}-\d{2}-\d{2})
\d{4} 匹配一个数字(等于 [0-9])
\d{4} matches a digit (equal to [0-9])
{4}量词 — 完全匹配4次
{4}Quantifier — Matches exactly 4 times
- 字面上匹配字符 - (区分大小写)
\d{2} 匹配一个数字(等于 [0-9])
\d{2} matches a digit (equal to [0-9])
{2}量词 — 完全匹配 2 次
{2}Quantifier — Matches exactly 2 times
- 字面上匹配字符 - (区分大小写)
\d{2} 匹配一个数字(等于 [0-9])
\d{2} matches a digit (equal to [0-9])
{2}量词 — 完全匹配 2 次
{2}Quantifier — Matches exactly 2 times
- 与字符 - 字面匹配 (区分大小写)
- matches the character - literally (case sensitive)
第三捕获组(\d+)
\d+ 匹配一个数字(等于 [0-9])
\d+ matches a digit (equal to [0-9])
+量词 - one 和 unlimited 次之间的匹配，尽可能多次，返回需要(贪婪)
+Quantifier — Matches between one and unlimited times, as many times as possible, giving back as needed (greedy)
第四捕获组(.*)?
? 量词 - 在 0 和 1 之间匹配，尽可能多，返回需要(贪婪)
? Quantifier — Matches between zero and one times, as many times as possible, giving back as needed (greedy)
.* 匹配任何字符(行终止符除外)
*量词——在零和无限次之间匹配，尽可能多的次数，返回需要(贪婪)
*Quantifier — Matches between zero and unlimited times, as many times as possible, giving back as needed (greedy)
$ 断言字符串末尾的位置
$ asserts position at the end of the string
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