compare two version notation strings in Bash

check-version.sh

#!/bin/bash

versionAccepted() {
    ### $1 is the minimum required version, $2 is the version in question;
    ### If $1 < $2, return 0 (the input version is accepted)
    ### otherwise, return 1 (not accepted)
    versions=( "$1" "$2" )
    #printf "${versions[*]}\n"

    for (( i=0; i<${#versions[@]}; ++i )); do
        ### Make it lowercases
        local v=${versions[$i],,}

        ### Strip off quots;
        ### Most of cases, it is not necessary, but
        ### Some tools return quoted version strings and
        ### the quotes may be here without being removed by the shell;
        [ "${v:0:1}" = "\"" ] && v=${v#\"} && v=${v%\"}
        [ "${v:0:1}" = "\'" ] && v=${v#\'} && v=${v%\'}

        ### [ Extension point ] Add rules to suit your version naming convension;

        ### [ Discussion ]
        ### e.g., You might expect that 1.8.0-alpha3 < 1.8.0-beta2,
        ### but this will be 1.8.0-alpha3 > 1.8.0-beta2
        ### unless you add a rule saying alpha comes before beta;
        ### ( Non-numerics will be ignored by default )
        ### So add a new rule as follows to make alpha < beta work
        ### v=${v/alpha/0.}; v=${v/beta/1.}

        ### Likewise, to make 1.8.0_0-ea < 1.8.0_0 work
        ### ( 'ea' stands for 'early access'; JRE/JDK uses this naming conversion )
        ### Add a rule as follows;
        ### v=${v/ea/}; v+=.

        versions[$i]=${v}
    done

    #printf "${versions[*]}\n"

    local lesserVersion=$( printf "%s\n%s" "${versions[0]}" "${versions[1]}" | tr -cs '0-9\n' '.' | sort -t . -k1,1 -k2,2 -k3,3 -k4,4 -k5,5 -k6,6 -k7,7 -k8,8 -k9,9 -g | head -1 )

    local minimumVersion=$( printf "%s" "${versions[0]}" | tr -cs '0-9' '.' )

    #printf "%s --- %s\n" "$minimumVersion" "$lesserVersion"

    [ "$lesserVersion" = "$minimumVersion" ]
}

versionAccepted "$1" "$2"