pub fn version_token(raw: &str) -> Option<String>
The version number in a CLI’s --version output, e.g. "2.1.285" from "2.1.285 (Claude Code)" or "codex-cli 0.154.0". None if there is none ("unknown", an empty string).
--version
"2.1.285"
"2.1.285 (Claude Code)"
"codex-cli 0.154.0"
None
"unknown"