I am trying to match the followings with egrep '201411[08|09|10|11]-[117|111]-'


But for some reasons, the 2nd character class pattern ([117|111]) doesn't work. It matches all regardless.

Any idea what goes wrong in my 2nd character class pattern?

  • Nothing to do with the problem at hand, but according to man grep,egrep has been deprecated and grep -E should be used.
    – Anthon
    Nov 12 '14 at 5:10
  • thanks for pointing out. I just tried grep -E just in case. Same issue.
    – Hei
    Nov 12 '14 at 5:13

You mix up character classes with subpatterns. You need the latter here:

grep -E '201411(08|09|10|11)-(117|111)-' file

"Character class" means: Every single char from the class (like [[:alpha:]]) or selection ([01][8901]) may appear.

"Subpattern" (with |) means: "One of the patterns separated by | may appear."


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