正则表达式，特定seq [英] Regular Expression, specific seq

问题描述

您好b $ b

如何匹配以下3组的特定序列。 aB必须在cD和eF之前出现。 cD必须在eF之前。

所有组都可以匹配多次，但是按照指定的顺序。



团体：

aB

cD

eF



匹配：

aBcDeF

aBcDcDeFeF



不配比赛

cDaBeF







我在尝试：



regex =新的正则表达式（@（aB） * \ G（cD）* \（eF）*）;



但是它以任何顺序与本集团匹配！

解决方案

当然它以任何顺序匹配组，因为这是你编写正则表达式的方式。这是一个想法：通过在圆括号中按给定顺序包含所有三个组来添加另一个组，并查找该根组的匹配。

- SA

Hi
how do i match a specific sequence of the 3 Groups below. aB must come before cD and eF. cD must come before eF.
All groups can match more than once, but in the specified order.

Groups:
aB
cD
eF

Should Match:
aBcDeF
aBcDcDeFeF

Should not Match
cDaBeF



I was trying:

regex = new Regex(@"(aB)*\G(cD)*\G(eF)*");

but it matches the Group in any order !

解决方案

Of course it matches the group in any order, because this is how you wrote your regular expression. Here is the idea: add another group by enclosing all three groups in the given order in round brackets and look for the match of this root group.

—SA

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