How to stop newline chars from escaping OLD gnu sed command

I am trying to replace a line in a file with multiple lines. When I had only one new line char ( ‘$’n ). it worked fine, however when I use two of them, it escapes my sed and the file wont run anymore.

sed 's/TextImLookingFor/My'$'nReplacement'$'nText/g' /path/to/File.txt

JavaScript
​x
 
sed 's/TextImLookingFor/My'$'nReplacement'$'nText/g' /path/to/File.txt​

File.txt:

This is a file
TextImLookingFor
look at all this text

JavaScript
 
This is a fileTextImLookingForlook at all this text​

DesiredOutput

This is a file
My
Replacement
Text
look at all this text

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This is a fileMyReplacementTextlook at all this text​

Actual Output

unexpected EOF while looking for matching ''''
syntax error: unexpected end of file

JavaScript
 
unexpected EOF while looking for matching ''''syntax error: unexpected end of file​

Answer

Using older BSD sed you can do:

sed $'s/TextImLookingFor/My\nReplacement\nText/' file
This is a file
My
Replacement
Text
look at all this text

JavaScript
 
sed $'s/TextImLookingFor/My\nReplacement\nText/' fileThis is a fileMyReplacementTextlook at all this text​

This should work with newer gnu-sed as well. However newer gnu-sed may just need:

sed 's/TextImLookingFor/MynReplacementnText/' file

JavaScript
 
sed 's/TextImLookingFor/MynReplacementnText/' file​

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Answer