Retest

What Retest is

Retest is a free, open-source terminal tool for developing and checking regular expressions on Linux. Give it a subject string as an argument or pipe one through standard input; release 0.2.2 also added a flag for reading the subject from a file. Retest finds all non-crossing matches and distinguishes nested capture groups from the full match with different colors. An optional formatted list presents matches in order with their string indexes. The project offers Linux release binaries, including a 64-bit Debian installer package listed for release 0.2.2. Its README describes building from source with Cargo and installing through a Makefile. Both source code and documentation are licensed under Apache License 2.0. Retest is presented as a terminal-based alternative to regex101, so its workflow centers on command-line input and output. The maintainer accepts questions by email, asking users to put “retest” in the subject line; feature suggestions can be sent by email or opened as GitHub issues. No paid plans or usage limits are listed.