tre

POSIX-compliant regex library with support for approximate matching

brewmacoslinux

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Lightweight, POSIX-compliant regular expression (regex) library

tre-agrep

Search for exact matches of a pattern in a file$ tre-agrep 'pattern' filename.txt

Find approximate matches allowing up to 2 errors (insertions, deletions, substitutions)$ tre-agrep -2 'searchterm' filename.txt

Case-insensitive search with approximate matching$ tre-agrep -i -1 'word' filename.txt