正则表达式有帮助！ [英] regular expressions help!

问题描述

我真的在正则表达式方面苦苦挣扎，我必须提供以下正则表达式的英文说明，任何人都可以请帮助我..

一世. a(aa)*
ii. a(b * ab * ab *)*
iii. b(b * ab * ab *)*

hi im really struggling with regular expression i have to give english descriptions of the following regular expressions can anyone please please please help me..

i. a(aa)*
ii. a(b*ab*ab*)*
iii. b(b*ab*ab*)*

推荐答案

i.找到一个"a"，然后是零个或多个倍的"aa"应该被看到
ii.找到一个"a"，然后是此模式的零次或多次:
(
零次或多次"b"，然后零次或多次"ab"，然后零次或多次"ab"
)
iii.找到一个"b"，然后是此模式的零次或多次:
(
零次或多次"b"，然后零次或多次"ab"，然后零次或多次"ab"
)

我认为可以将两个 ab * 合并为一个 ab * .你不这样认为吗?

i. Find a "a" followed by either zero or more times "aa"s should be seen
ii. Find a "a" followed by either zero or more times of this pattern :
(
zero or more times "b" followed by zero or more times "ab" followed by zero or more times "ab"
)
iii. Find a "b" followed by either zero or more times of this pattern :
(
zero or more times "b" followed by zero or more times "ab" followed by zero or more times "ab"
)

I think two ab* could be merged to a one ab*. Don''t you think so ?

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