Shell Programming and Scripting

Where is the string you wnat to match? Is it in a file or is it already in a variable?

If it's in a variable:

Code:

case $var in
     *\${INSTANCE}*| *\$INSTANCE* )
        echo MATCH;;
     *) echo NO MATCH ;;
esac

If it's in a file or the output of a command, use grep:

Code:

grep -e '${INSTANCE}' -e '$INSTANCE'

 
$ echo '/data}/{bla/${INSTANCE}' | perl -ne '/\$\{?(\w+)\}?/;print $1'
INSTANCE
 
$ echo '/data}/{bla/$INSTANCE' | perl -ne '/\$\{?(\w+)\}?/;print $1'
INSTANCE

You haven't answered the question:

Where is the string you want to match?

Is it in a file?
Is it already in a variable?
Is it the output of a command?

Are you looking for it in a single line? Or in a file containing more than one line?