CODEWITHSUNDEEP
grep
Yishu Fang
Yishu Fang

Reputation: 9978

why grep promt "Invalid range end"?

I have a file a:

$ cat a 
abcd
kaka

when using the command:

$ grep -e '[a-d]' a
abcd
kaka

It works well, but why those command is not right?

$ grep -e '[\x61-\x74]' a 
grep: Invalid range end

$ grep -e '[\u0061-\u0074]' a 
grep: Invalid range end

Upvotes: 4

Views: 11639

Answers (1)

devnull
devnull

Reputation: 123608

Assuming that your version of grep supports PCRE ("Perl-compatible regular expressions"), you can try:

grep -P '[\x61-\x74]' a

This would return the expected output:

abcd
kaka

Upvotes: 3

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