Shell Scripting Problem - Invalid Back Reference

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http://www.unix.com – Here is the question... Create a new script, sub2, taking three parameters... 1.) the string to be replaced 2.) the string with which to replace it 3.) the name of the file in which to make the substitution ...that treats the string to be replaced as plain text instead of as a regular expression. Hint 1: Try to get the string to be replaced into a shell variable (e.g., $target). Then use a sed command to rewrite any special regular expression characters in that string so that they get treated as text, storing the result in a second shell variable (e.g., $newTarget). Then issue the actu (HowTos)