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  • Thanks! The other solution I just found was to include the dot as the only option, as it does not need escaping inside option brackets, i.e. ^[A-Za-z0-9\ ,]+[.]1 Commented Mar 24, 2021 at 14:47
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    Yes, you can rewrite the regex to not need a backslash. Note also that space doesn't require a backslash, whether in a character set or outside. But it is needed to prevent the shell from splitting the regex. Just use single quotes unless you are sure you don't need them. Commented Mar 24, 2021 at 14:52
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    And in default Zsh, or in Bash with failglob set, the second will error out, so better just quote everything that looks like a shell glob. Also, the ERE [A-Za-z0-9\ ,] will match a backslash too. In the first command here egrep does see it because it's quoted. Commented Mar 24, 2021 at 14:59