grep: The term 'grep' refers to a Unix command that searches files for lines matching a regular expression. It comes from syntax usage for the Unix qed/ed editor subcommand: "g/re/p", where 're' means regular expression, 'g' means globally search, and 'p' means Print the lines that contain matches.

There are other Unix variants:
  - fgrep - searches for fixed strings only
  - egrep - capable of extended regular expressions.

The advanced regular expression operators in Funduc Search and Replace are 'egrep' type operators.