早上看了个老外的正则练习题，发现几个句子看不懂，具体是一个单词AS看不懂，不知道啥意思，拜托各位英文好的翻译下。
Whata regex expression do you use to match AS 213 in the following string?
(213 317) 1213 316 31
A,^\(213
B,^(213
C,^213_
D,^(213_
E,^\(213_
下面还有一个
what single regex expression do you use to match only AS sequences 23 45 and 23 78 45 in an AS Path?
这里的AS ,AS Path是什么意思
Whata regex expression do you use to match AS 213 in the following string?
(213 317) 1213 316 31
A,^\(213
B,^(213
C,^213_
D,^(213_
E,^\(213_
下面还有一个
what single regex expression do you use to match only AS sequences 23 45 and 23 78 45 in an AS Path?
这里的AS ,AS Path是什么意思
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