grep golfing technique

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Problem

Did you know that

grep -e "abc" -e "de*f" -e "g[hij]k"

is equal to:

grep "abc
de*f
g[hij]k"

Problem by 4spot1, on 2022-06-29 17:35 UTC+9.

Options

exec is denied

rejudge feature is enabled

now post-mortem time, all source codes will be revealed

Sample input:_

grep -e "abc" -e "de*f" -e "g[hij]k"

Sample output:

grep "abc
de*f
g[hij]k"

Sample input:_

grep -e "a\(b*c*d\)e\{,6\}\1" -e "^f" -e "g.h$"

Sample output:

grep "a\(b*c*d\)e\{,6\}\1
^f
g.h$"

Sample input:_

grep -e "a\.b[^cd]" -e "[[:cntrl:]]" -e "[[=g=]][hi]{"

Sample output:

grep "a\.b[^cd]
[[:cntrl:]]
[[=g=]][hi]{"

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