regex - How do I lowercase all MD5 hashes inside of a file?

Question

I'm reposting this question with more context and examples because admittedly my last post was rushed. I'm trying to find ALL MD5 hashes (based off the regex) and simply lowercase them (regardless of format, and regardless of what else is on the line).

I previously posted a similar question related to lowercasing emails and this was the solved answer (maybe this can assist in finding the answer).

sed -e 's/^\([^@]*\)@/\L\1@/' file

The MD5 Regex I use is: [a-f0-9]{32}

I'll provide some examples now (each line is unique - there's NOT a set pattern)

Input data:

fwefwe:few32rfwe:3r2frewg:-::d3ewStack:D077F244DEF8A70E5EA758BD8352FCD8
fwefwe:few33rfwe:3r2frewg:-::dsasaewStack:06D80EB0C50B49A509B49F2424E8C805
fwefwe:few34rfwe:3r2f3213ef::2d3ewStack:F1BDF5ED1D7AD7EDE4E3809BD35644B0
fwefwe:few35rf32re4frewgre3frewg:-::d3ewStack:DDE2C7AD63AD86D6A18DE781205D194F

Output data:

fwefwe:few32rfwe:3r2frewg:-::d3ewStack:d077f244def8a70e5ea758bd8352fcd8
fwefwe:few33rfwe:3r2frewg:-::dsasaewStack:06d80eb0c50b49a509b49f2424e8c805
fwefwe:few34rfwe:3r2f3213ef::2d3ewStack:f1bdf5ed1d7ad7ede4e3809bd35644b0
fwefwe:few35rf32re4frewgre3frewg:-::d3ewStack:dde2c7ad63ad86d6a18de781205d194f

标签： regexsedgnu

Answer 1

您可以使用

sed -E 's/[A-F0-9]{32}/\L&/g' file

如果您还想修改现有文件添加-i选项：

sed -i -E 's/[A-F0-9]{32}/\L&/g' file

关键是您需要使用一个-E选项来启用 POSIX ERE 正则表达式语法并在不转义的情况下编写{...}量词。POSIX BRE 等效项看起来像sed -i 's/[A-F0-9]\{32\}/\L&/g' file.

此外，我添加了g标志来修改一行上的所有匹配项。