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lang-bash
^[[:upper:]][[:alnum:]]{8,15}$followed by checks for[[:lower:]]and[[:digit:]]. It'll be far easier to understand and maintain.if [[ "$pass" =~ ^[[:upper:]][[:alnum:]]{8,15}$ && "$pass =~ [[:lower:]]+[[:digit:]]+ ]]? I think the order of second condition will matter then.