sed 命令中的 / 可以用任意字符替换 特别地当处理网址相关问题时
官方说明： The / characters may be uniformly replaced by any other single character within any given s command. The / character (or whatever other character is used in its stead) can appear in the regexp or replacement only if it is preceded by a \ character. 来源： https://www.gnu.org/software/sed/manual/sed.html#The-_0022s_0022-Command 如： sed -E 's#(http.*github[^/]*/)#https://github.crazypeace.workers.dev/\1#g' 和 sed -E 's/(http.*github[^/]*\/)/https:\/\/github.crazypeace.workers.dev\/\1/g' 等同。
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