Variable in sed


I've the problem with my shell script:

sed 's/$search_word/$replace_word/g'  testfile
cat testfile

How do I make sed take variables $seach_word and $replace_word instead
of "SEARCH" and "REPLACE"?

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wesly_chenAuthor Commented:
It's bourne or bash shell.
Try double quotes:

sed "s/$search_word/$replace_word/g"  testfile

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wesly_chenAuthor Commented:
You are right. I forget the difference between single quote and double quote.

I have a question here.
What if  the variable "replace_word" contains '/' . For ex: HOME variable in Linux

sed "s/$search_word/$HOME/g"  testfile

gives error "sed: -e expression #1, char 7: Unknown option to `s'"
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