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The Overview page has plenty of details explaining the differences and why they exist: https://github.com/ezrosent/frawk/blob/master/info/overview.md https://g

• dotancohen 5y ago
  The only real-world difference that I see would be that frawk uses Rust's regex syntax, not awk's regex syntax. I'm actually willing to write that off as an improvement, though it may break scripts. I'd like to see this hidden behind a flag, and the classic awk regex syntax used without the flag. For now, while the classic syntax is unavailable, frawk should error wit ha message that classic syntax is not yet supported. Right now it is too big a footgun. That said, gawk uses PCRE but awk does not. So varying regex implmentations already infect the awk ecosystem. I believe that Debian distros actually install mawk when installing awk via the standard repos. mawk has its own incompatibilities with awk, such as empty string representation.
  • asicsp 5y ago
    >gawk uses PCRE ERE with GNU extensions would be more apt here (PCRE has many more powerful features): https://www.gnu.org/software/gawk/manual/html_node/GNU-Regexp-Operators.html#GNU-Regexp-Operators https://www.gnu.org/software/gawk/manual/html_node/GNU-Regex...