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git grep --line-regexp

git grep does not seem to support the --line-regexp switch. A simple alternative might be grep --line-regexp ... $(git ls-files)

[AQgw]

Regex for third-last char of a base64 value which ends with ==.

[AEIMQUYcgkosw048]

Regex for penultimate char of a base64 value which ends with =.