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    [[ $1 =~ .*\d+.* ]] && echo "The name must not contain digits" && exit 1

    echo "Oh no"

This script prints "Oh no" regardless if the first argument contains numeric characters or not. What am I doing wrong?

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    \d is a PCRE extension. ERE (the POSIX regular expression standard) only guarantees [[:digit:]]. If you use \d in bash, it'll work on some operating systems -- where the standard C library's regex functions are extended -- and not others; it's always more reliable to stick to what the standard guarantees. Commented Oct 20, 2020 at 15:19
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    BTW, =~ doesn't do any implicit anchoring, so just [[ $1 =~ [[:digit:]] ]] will do; no need for the .*s. Commented Oct 20, 2020 at 15:21
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