从另一个列表中的一个列表中查找字符串并找到返回的字符串 [英] Find String from One List within Another List and Return String Found

问题描述

我在>电源查询中的匹配列表/表中找到了我要找的内容，但我还需要更多。

I found part of what I was looking for at Matchlists/tables in power query, but I need a bit more.

使用 ListB中一行的内容可能只是该行内容的一部分请注意，在下面的查询中，ListB包含 roo，这是单词室中的前三个字母。

Using the "Flags only" example provided at Matchlists/tables in power query, I’m comparing two lists, ListA and ListB, to check if ListB’s row content appears in ListA’s row content at all. I can’t do a one-for-one match of both rows’ contents (like with List.Intersect) because the content of a row in ListB might only be part of the content of a row in ListA.

我想知道 roo在ListA的行中，该行在我的房间里。

Note that, in the query below, ListB includes "roo", which is the first three letters in the word room. I would want to know that "roo" is in ListA’s row that has "in my room."

由高级查询中的匹配列表/表已经确定 roo是ListA所在行中我的房间的一部分。 我在该示例的基础上分配了是，而不是在ListA和ListB之间存在这种匹配时为true。

The "Flags only" example provided by Matchlists/tables in power query already determines that "roo" is part of ListA’s row that has "in my room." I built on the example to assign "yes," instead of true when there is such a match between the ListA and ListB.

我想做的是用ListB中的实际值替换是，例如，值 roo。我试图简单地用wordB代替是，但是我得到一个错误，即无法识别wordB。

What I’d like to do is to replace "yes" with the actual value from ListB — the value "roo," for instance. I tried to simply substitute wordB for "yes" but I got an error that wordB wasn’t recognized.

let
    ListA = {"help me rhonda",  "in my room", "good vibrations", "god only knows"},
    ListB = {"roo", "me", "only"},
    contains_word=List.Transform(ListA, (lineA)=>if List.MatchesAny(ListB, (wordB)=>Text.Contains(lineA, wordB)) = true then "yes" else "no")
in
    contains_word

当前查询的结果如下：

    List
1   yes
2   yes
3   no
4   yes

我希望查询结果为：

    List
1   roo
2   me
3   
4   only

有什么想法吗？

（ps我对Power Query非常了解/ M）

(p.s. I'm extremely new to Power Query / M)

谢谢

推荐答案

我会这样做：

let
    ListA = {"help me rhonda",  "in my room", "good vibrations", "god only knows"},
    ListB = {"roo", "me", "only"},
    contains_word=List.Transform(ListA, (lineA)=>List.Select(List.Transform(ListB, (wordB)=>if Text.Contains(lineA, wordB) = true then wordB else null), (x)=>x <> null){0}?)
in
    contains_word

[edited]

这个想法是使用List.Transform两次：内部一个更改列表B只保留匹配的值。然后第一个非null值的最新值替换列表A（外部List.Tramsform）中的字符串。

The idea is to use List.Transform twice: inner one changes list B to leave only matching values. Then 1st non-null of latest replaces string from list A (outer List.Tramsform).

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