How to extract the last part of the string in Excel after the last underscore

问题

I have the following example data:

1. animated_brand_300x250
2. animated_brand_300x600
3. customaffin_greenliving_solarhome_anim_outage_offer

How to extract the string from the last underscore in Microsoft Excel?

I want to extract the value before the first underscore and after the last underscore.

First underscore:

=LEFT(B6,SEARCH(“_”,B6)-1)

would return animated and customaffin as output.

How to return the string after the last underscore?

回答1:

You can find the string after the last _ using the RIGHT function. The tricky part is to find the position of the last _.

First, we need to determine, how many _ there are. This can be done be removing all _ and compare the length of both strings:

LEN(A1)-LEN(SUBSTITUTE(A1;"_";""))

Since we now know that it is the second occurrence of _ that we have to look for, we can use the SUBSTITUTE function to replace the second occurrence of _ with another character (this has to be a character that is not part of your original string - I have chosen#).

Now, we use the FIND function to search for the position of the # character. This position can now be delivered to the RIGHT function.

Your final formula will be:

=RIGHT(A1;LEN(A1)-FIND("#";SUBSTITUTE(A1;"_";"#";LEN(A1)-LEN(SUBSTITUTE(A1;"_";"")));1))

回答2:

Some other options could be:

=TRIM(RIGHT(SUBSTITUTE(A1,"_",REPT(" ",100)),100))

Or using FILTERXML, being theoretically a better option:

=FILTERXML("<t><s>"&SUBSTITUTE(A1,"_","</s><s>")&"</s></t>","//s[last()]")

An ExcelO365 exclusive method could even be to use XLOOKUP:

=REPLACE(A1,1,XLOOKUP("_",MID(A1,SEQUENCE(LEN(A1)),1),SEQUENCE(LEN(A1)),,0,-1),"")

Or:

=RIGHT(A1,MATCH("_",MID(A1,SEQUENCE(LEN(A1),,LEN(A1),-1),1),0)-1)

来源：https://stackoverflow.com/questions/63237935/how-to-extract-the-last-part-of-the-string-in-excel-after-the-last-underscore