For example the regular expression a (b (C)) has the subgroups (b (C)) and (C).

例如，正则表达式a (B (C))包含子组(B (C))和(C)。

youdao

Typing ls [a-c]* finds all file names that begin with a, b, or c. Here, the * does not modify the [a-c] as grep's interpreter would; in the shell, * is interpreted as .*.

键入 ls [a-c]* 以查找以 a、b 或 c 开头的所有文件名。 此处的 * 在 Shell 中不像 grep 的解释器那样修饰 [a-c]，* 被解释为 .*。?

youdao

The optimizer has been able to do algebraic simplification on a+a, instead generating 2*a, and on (c*b)*12 + c*b, instead generating (c*b)*13.

该编译器可以对 a+a 进行代数简化，即改为生成 2*a，也可以对 (c*b)*12 + c*b 进行代数简化，即改为生成 (c*b)*13。

youdao

An A is worth four points, a B three points, a C two points and a D one point.

VOA: special.2009.03.05

So basically we're saying yes, we can go from point a to point c without ever going through point b.

所以我们说的是我们可以从,ａ点不经过ｂ点而到达ｃ点。

麻省理工公开课 - 化学原理课程节选

a You know that what will happen is that heat will flow from a to b from b to c and from a to c. That's common-sense.

你知道会发生的是热量从流向,从流向,以及从流向。

麻省理工公开课 - 热力学与动力学课程节选

Second, there was a negative divergence between the slow (19-39 day) MACD and the price chart from A to B. (That is, the price at B is higher than at A, but the MACD is lower at B than it was at A.) The lower high at C compared to B was confirmed by a lower MACD high at C than at B.

FORBES: Banking Breakdown

But levels of brain activity in a region tied to behavioral change suggested the ranking C, B, A. That ranking better captured real-world performance.

WSJ: Smart Blankets, Brain Waves About Ads and College Paperwork | Week in Ideas

He called for a declassification of some drugs so cannabis would move from class B to class C and ecstasy from A to B, even allowing some severe heroin users access to injecting rooms.

BBC: Can lessons be learned from Portugal's drug laws?