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I have a list of patterns (regexes) in a file and use with `grep -f <file_with_list_of_regexes.txt> input.txt` to search in my input for those patterns. grep is doing a fantastic job at it and finds...

# echo 3 | grep ^[123456789]+$
# echo 34 | grep ^[123456789]+$
#

but why not the above print "3" and "34" (respectively) if '+' should match one or more of the previous characters?

understood. Now I realize I also misinterpreted the output of `echo 3 | grep ^[0123456789]*$` even though it showed the result I expected.

I should be reading it as:
"Match characters
^ -...

I have a basic question regarding * and . while using regex:

# echo 3 | grep ^[0123456789]*$
3

I think I understood why it outputs "3" here (because '*' matches zero or more of the previous...

I know the subject line is very similar to: destination host unreachable (http://www.linuxquestions.org/questions/linux-networking-3/destination-host-unreachable-307368/)

but the problem with my...