如何在Excel中y个字符后替换x的第一个实例？

Question

I would like to use a formula to replace the first instance of a character, starting the search after a specific amount of characters from the right (including spaces). eg in the sentence:

  One two three four Five six seven eight nine.

I would like to replace the first instance of a space (" ") with an underscore, starting the search after 17 characters (after "u" in the word "four") so the formula returns:

  One two three four_Five Six seven eight nine.

Please help!

Answer 1

您可以使用REPLACE ：

=REPLACE(A1,FIND(" ",A1,17),1,"_")

Answer 2

What about below formula. Try it...

=LEFT(A1,SEARCH(" ",A1,17)-1) & "_" & MID(A1,SEARCH(" ",A1,17),LEN(A1)-SEARCH(" ",A1,17)+1)