AGREP - approximate GREP for fast fuzzy string searching. Files are searched for a string or regular expression, with approximate matching capabilities and user-definable records. Developed 1989-1991 by Udi Manber, Sun Wu et al. at the University of Arizona. ISC open source license since Sept. 2014.
Working around this is possible by piping to awk and using an NR==FNR program. It would wonderful to have access to grep like -B and -A context lines.