Regex - nested patterns - within outer pattern but exclude inner pattern

Question

I have a file with the content below.

 ${ dontReplaceMe } ReplaceMe ${dontReplaceMeEither} 

I want to match \'Replac

Answer 1

sed -i 's/\sReplaceMe\s<\/td>/Replaced<\/td>/gi' input.file

worked for me.

you may consider using -i.bak to backup the old file, in case of a mistake.

alternatively,

perl -pi -e 's/\sReplaceMe\s<\/td>/Replaced<\/td>/g' temp

also works, again, note the -pi.bak to backup.