一个用正则表达式在线闯关的网站：https://alf.nu
正则闯关一共17题：https://alf.nu/RegexGolf#accesstoken=iXkmvEAWnP8kXzcY0m1J
每一题下面会给出两列字符串，左侧是要求匹配的，同时你也不能匹配右边的。
Q1: Warmup – Type a regex in the box.
答案：foo (公共部分)
Q2: Anchors – You are deducted one point per character you use, and ten if you match something you shouldn’t.
答案：k$ (左边全部是以k结尾)
Q3: It never ends – $ not allowed
答案: u\b (以b结尾)
Q4: Ranges – The test vectors were generated by grepping /usr/dict/words. Can you tell?
答案：[a-f]{4,} (4个以上a-f之间的字母组成)
Q5: Backrefs – This doesn’t really work as a tutorial. Not really clear what you’re supposed to do here.
答案：(\w{3})\w?.*?\1 (首尾都是相同的3个字母)
Q6: Abba – Let’s pretend this one is not a rehash of the last one.
答案：^(?!\w*(\w)(\w)\2\1) (匹配不带有’abba’形的单词)
Q7: A man, a plan – You’re allowed to cheat a little. Even in hard mode, words will be no longer than 13 characters.
答案：^(\w)(\w).*?\2\1$ (回文字符串，这里我的不太标准，只匹配了两位)
Q8: Prime
匹配合数：^x?$|^(xx+?)\1+$
答案：^(?!(..+)\1+$) (前瞻枚举不是合数的)
Q9: Four – You can get an extra point by ignoring the name of this level.
答案：(\w)?(\w)(\w)\2(\w)\2(\w)\2 (首先要匹配带有’axbxcxdx’类型的，用(\w)(\w)(\w)\2(\w)\2(\w)\2就行，其次要考虑到’elevener’的类型是’xaxbxcxd’)
Q10: Order – Cheat.
答案：\b[a-m]\w{3,4}[m-z]\b (‘a-m’的字母做开头，中间3-4个字母，最后是’m-z’的字母结尾)
水平有限，暂时只到第十关，后续再更。
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