Simple proof-of-concept for finding and replacing specified text patterns in a Cisco configuration file. The patterns and associated replacement text are loaded from a definitions file.
patternReplace.py -s SOURCE [-o OUTPUT] [-c CONFIG] [-v]
The OUTPUT defaults to stdout. The CONFIG defaults to config.txt. The -v flag will
trigger verbose output to stderr.
The regex expressions in the config file should not overlap. They're matched in order, but every pattern is tried against every line. There's no guarantee what the output would be if overlapping patterns were matched.