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lang-bash
zshseems to have problem with[![:blank:]], it raise:bis invalid modifier. Inshandkshemulate, it raise event not found for[var=foo zsh -c 'case ${var+x$var} in (x*[![:blank:]]*) echo x; esac'is OK for me. The event not found would only be for interactive shells.:binvalid modifier is a bit strange.shisbashbuilt with--enable-xpg-echo-defaultand--enable-strict-posix-defaultso as to be Unix compliant (which involvesecho '\t'outputting a tab).