问题
I would like to use a lookup table to choose a tag for each row according to its description column. Descriptions contain keywords that map to tags. Therefore, I need to partially match against the keyword list as below:
A B C D E
1 Description Tag Keyword Tag
2 lorem KEYA ipsum KEYA Tag A
3 dolor sit KEYC amet KEYB Tag B
4 KEYB consectetur KEYC Tag C
5 adipiscing elit KEYA KEYD Tag D
6 sed do KEYB eiusmod
I would like to fill cells in column B with values from the lookup table in D2:E5. I could use something like
=VLOOKUP("."&$A2&".", $D$3:$E$6, 2, 0)
but it won't work because I try to match full text against partial texts.
=VLOOKUP($A2, "."&$D$3:$E$6&".", 2, 0)
does not work either. Apparently regular expressions are only supported in the search criterion. And I don't like to write something like
=IF(ISNUMBER(SEARCH("KEYA",$A2)), "Tag A",
IF(ISNUMBER(SEARCH("KEYB",$A2)), "Tag B",
IF(ISNUMBER(SEARCH("KEYC",$A2)), "Tag C",
IF(ISNUMBER(SEARCH("KEYD",$A2)), "Tag D",
""))))
Do you have any suggestions?
回答1:
Try putting this array formula in B2 using Ctrl-Shift-Enter and copying it down:-
=INDEX(E$2:E$5,MAX((NOT(ISERROR(FIND(D$2:D$5,A2)))*ROW(D$2:$D$5))-1))
It uses FIND to try and match each of the keys in turn anywhere in A2. If one matches, it works out the corresponding row number in D$2:D$5. It takes the maximum matching row, and uses INDEX to find the corresponding element in E$2:E$5. If there is no matching key, it gives a #VALUE! error.
The matching with FIND is case-sensitive: if you didn't want it to be case-sensitive, you would need to use SEARCH instead of FIND.
If you could ever have a case with two or more matching keys, e.g.
lorem KEYA KEYB ipsum
you would get the last matching one in the list i.e. TAG B.
回答2:
Parse the KEYx text from column A to use as the lookup_value in your VLOOKUP.
The formula in B2 is =IFERROR(VLOOKUP(MID(A2,FIND("KEY",A2),4),$C$2:$D$5,2,FALSE),"").
Addendum: For OpenOffice/LibreOffice:
The formula for B2 would be =IF(ISERROR(VLOOKUP(MID(A2;FIND("KEY";A2);4);$C$2:$D$5;2;0));"";VLOOKUP(MID(A2;FIND("KEY";A2);4);$C$2:$D$5;2;0)). Fill down as necessary.
来源：https://stackoverflow.com/questions/26340878/excel-libreoffice-calc-partial-match-in-reverse