I noticed that variables are highlighted only in double quotes.
What about non-quoted ones?
贡献者指南
技术栈
shell
领域
clideveloper experience
议题类型
feature
难度面向新贡献者的预计实现难度，1 表示很小改动，5 表示专家级工作。
2
预计时间有经验贡献者完成调查、实现、测试并准备 pull request 的粗略时间范围。
1-3 hours
活动状态议题当前的可参与程度：新鲜、活跃、陈旧、阻塞或等待维护者输入。
stale
清晰度议题是否清楚说明期望改动、验收标准和下一步。
clear
前置要求
basic shell scriptingfamiliarity with zsh syntax highlighting
新手友好度1-100 的估计分数，表示该议题对首次贡献者的友好程度。
70
研究方向
Investigate the highlighting logic in the zsh syntax highlighting plugin. Look for the pattern that currently only highlights variables in double quotes. The relevant file is likely `zsh syntax highlighting.zsh` or similar. Search for regex patterns that match `${...}` and extend to also match unquoted `$...` without quotes. Consider the parsing context to avoid conflicts with other expansions.
