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Excellent! Changed the ' to " on the sed statement and viola. Many thanks!

Although I'm unsure how the command line knows the difference between the text created by me and the sed statement. They...

> reverse=`tput rev`
> revert=`tput sgr0`

> var="This is some note."
> echo $var
This is some note.

> var2="This is ${reverse}some${revert} note."
> echo $var2
This is some note.

>...

> cat notes.data | sed 's/note\([^a-z]\|$\)/notez\1/g'
1<-->01/20/12<-->01/20/12<-->1st note<-->1st note<-NL->2 lines
2<-->01/20/12<-->01/20/12<-->2nd note<-->2nd note<-NL->more lines<-NL->here...

Would that also work when "note" is not the last word in the field? It could vary well be the first, last or anywhere in between. The problem I have run up against with regular expressions was...

To give you some context of my issue the following is some sample dummy data. The field delimiter is "<-->". The 4th field is going to be tags for my notes. The tags should always be unique and...