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  • Thank you for the link Commented Jan 17, 2020 at 10:25
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    Escaping a dash in a bracketed expression would not help. Note that backslashes have no special meaning to the expression inside [...]. This also means that [\.] matches a dot or a backslash. Commented Jan 17, 2020 at 11:59
  • Really? I doubt. To match forward slash, you have to escape it twice \\ to match it Commented Jan 17, 2020 at 15:12
  • @JamesJohn Try e.g. grep '[\]' <<<'\', or grep -o '[\.]' <<<'123\.abc' Commented Jan 17, 2020 at 16:01
  • Paste the problem in grep and see the error, then apply my fix to fix it Commented Jan 17, 2020 at 17:44