Underscore is not recognized as substitution separator

[Vvalter]

According to :help E146 it's possible in vim to use other separators with substitution than /. In particular, it's possible in vim to use underscore as separator. E.g. :%s_a_b_g will replace all occurrences of a with b in the whole document.
Ideavim does not accept underscore as separator (other separators work fine).

The reason is that s_a_b_g gets lexed as IDENTIFIER_ANY_CASE_WITH_DIGITS_AND_UNDERSCORES which matches OtherCommand instead of CommandWithBars.
I'm not that familiar with ANTLR, but I don't see a clean way to fix this in the grammar. Manually reparsing the token later only seems like a too ugly hack to me. Does anybody see a clean way to fix this?

By the way, vim explicitly forbids \, ", and | as separators, but Ideavim accepts them and does either no replacements or weird replacements. E.g. :%s"a"b"g seems to insert underscores in front of single quotes?

[AlexPl292]

@lippfi could you please take a look on these two issues?

[lippfi]

The fix is available in the IdeaVim 1.8.0. Thank your for your report!

By the way, vim explicitly forbids , ", and | as separators, but Ideavim accepts them and does either no replacements or weird replacements. E.g. :%s"a"b"g seems to insert underscores in front of single quotes?

In such cases IdeaVim (and Vim) uses the last used pattern

[Vvalter]

Thanks for the quick fix 🥇