Separate words with commas in Excel 2010 -

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i'm trying use formula in excel separate bunch of words in cell comma. if there more 5 words in cell, want first 5 words. first 5 words in cell , separate them comma use this:

=substitute(left(a1,find("^",substitute(a1," ","^",5))-1), " ", ", ")

this works fine. problem this, because of number 5 here, if cell contains less 5 words, error. tried substitute 5 this:

len(trim(a1))-len(substitute(a1," ",""))+1

so function becomes this:

=substitute(left(a1,find("^",substitute(a1," ","^",len(trim(a1))-len(substitute(a1," ",""))+1))-1), " ", ", ")

but doesn't work, gives me error. idea how can please?

also ignore first word if first character "-" (without quotes) , start second word. in other words, want this:

i love life should return i, love, my, life, very
- love life should return i, love, my, life, (the "-" ignored")
love should return i, love, my

thanks in advance help

here's different approach. aside "less 5" issue, deals "5 words no space @ end" issue:

=left(a1,find("^",substitute(a1 & "^"," ","^",5))-1)

edit 1: noticed part leading "- ". addition isn't elegant, deals it, , trims trailing spaces:

=trim(left(if(left(a1,2)="- ",mid(a1,3,999),a1),find("^",substitute(if(left(a1,2)="- ",mid(a1,3,999),a1) & "^"," ","^",5))-1))

edit 2: oh yeah, commas:

=substitute(trim(left(if(left(a1,2)="- ",mid(a1,3,999),a1),find("^",substitute(if(left(a1,2)="- ",mid(a1,3,999),a1) & "^"," ","^",5))-1))," ",",")

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