find and grep Regular Expressions

Always use the extended version of the regular expressions. In find:

find -E ./ -iregex ".*((zip)|(gz))$"

is equivalent to

find .| grep  -iE ".*((zip)|(gz))$"

Use this to search for this pattern or that pattern. The parenthesis to group expressions this way only work in extended (as grep(1) calls them) or modern (as re_format(7) calls them).

In grep use -i to ignore case. In find, use -iregex to ignore case.

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