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#!/bin/bash
var=$1
if [[ $var =~ [\`\$\=\/] ]]; then
    echo 'no'
    exit
fi
declare "$var"=test 2>/dev/null
if [[ ${!var} == 'test' || $1 == 'var' ]]; then
    echo 'yes'
else
    echo 'no'
fi

This will try to assign the value test to the provided value. If it succeeds (if the value is a valid variable name) it will match the if test and echo yes, else it will echo no.

#!/bin/bash
var=$1
if [[ $var =~ [\`\$\=\/] || $var =~ \[ ]]; then
    echo 'no'
    exit
fi
declare "$var"=test 2>/dev/null
if [[ ${!var} == 'test' || $1 == 'var' ]]; then
    echo 'yes'
else
    echo 'no'
fi

This will try to assign the value test to the provided value. If it succeeds (if the value is a valid variable name) it will match the if test and echo yes, else it will echo no.

#!/bin/bash
var=$1
if [[ $var =~ [\`\$\=\/] ]]; then
    echo 'no'
    exit
fi
declare $var=test
if [[ ${!var} == 'test' || $1 == 'var' ]]; then
    echo 'yes'
else
    echo 'no'
fi

This will try to assign the value test to the provided value. If it succeeds (if the value is a valid variable name) it will match the if test and echo yes, else it will echo no.

#!/bin/bash
var=$1
if [[ $var =~ [\`\$\=\/] ]]; then
    echo 'no'
    exit
fi
declare "$var"=test 2>/dev/null
if [[ ${!var} == 'test' || $1 == 'var' ]]; then
    echo 'yes'
else
    echo 'no'
fi

This will try to assign the value test to the provided value. If it succeeds (if the value is a valid variable name) it will match the if test and echo yes, else it will echo no.

#!/bin/bash
var=$1
if [[ $var =~ [\`\$] ]]; then
    echo 'no'
    exit
fi
declare $var=test
if [[ ${!var} == 'test' || $1 == 'var' ]]; then
    echo 'yes'
else
    echo 'no'
fi

This will try to assign the value test to the provided value. If it succeeds (if the value is a valid variable name) it will match the if test and echo yes, else it will echo no.

#!/bin/bash
var=$1
if [[ $var =~ [\`\$\=\/] ]]; then
    echo 'no'
    exit
fi
declare $var=test
if [[ ${!var} == 'test' || $1 == 'var' ]]; then
    echo 'yes'
else
    echo 'no'
fi

This will try to assign the value test to the provided value. If it succeeds (if the value is a valid variable name) it will match the if test and echo yes, else it will echo no.