我在adam2 zsh提示符中找到了它，我不知道它的含义。 显然它计算“字符串”的长度，但它是如何做到的超出了我的理解。
${#${(S%%)string//(\%([KF1]|){*}|\%[Bbkf])}}
I googled “zsh Immediate regex”, and found this。 它说,只有一美元是内容的长度。 这一链接也比zshuser s Guide更为有用。 我发现。
你的模式计算在剥离某些ANSI风格的字符格式后字符串的长度。
大约
${# } - 长度
${ } - 嵌套的
<代码>(%)——从尾开始的搜索次
// - 全局替换（在这种情况下，删除，因为后面没有斜杠）
（ ）- 捕获组
[KF1] - 字符列表：K=开始背景颜色，F=开始前景颜色
【Bbkf】- 字符清单：B=开始加粗，b=结束加粗，k=结束背景，f=结束前景色
然后我迷路了。
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