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  1. Prepare
  2. Linux Shell
  3. Grep Sed Awk
  4. 'Grep' - B
  5. Discussions

'Grep' - B

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87 Discussions

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  • ataua_doederlein
     + 0 comments
     grep '\(\d\)\s*\1'

    there could be zero or one space between the repeated numbers...

  • j1001infor
     + 0 comments

    I don't know why 9999 5628 9201 1232 shouldn't be in the output. I guess the test has some part wrong.

  • fredericreinhar1
     + 1 comment
    grep "\([0-9]\) \?\1"

    On my system (Ubuntu 20.04 with GNU grep 3.4 the following simpler command works as well: grep -E "([0-9]) ?\1" I don't understand why it doesn't work here.

  • cc111091
     + 0 comments
    grep "\(\d\)\s?\1"

  • triciatzy
     + 0 comments

    grep '\([0-9]\)[[:space:]]*\1'