#!/bin/bash
str="75.00 W, 170.00 W"
function str_check {
    pow_array=()
    regexp='([0-9]+)\.[0-9]+[[:space:]]W,[[:space:]]([0-9]+)\.[0-9]+[[:space:]]W'
    [[ $str =~ $regexp ]] && for (( i = 0; i < 3; i++ )); do
        pow_array+=("${BASH_REMATCH[$i]}")
    done
    if [ "$1" -lt ${pow_array[1]} ]; then
        echo "Available power limit is ${pow_array[0]}"
        echo "Setting up ${pow_array[1]}"
    elif [ "$1" -gt "${pow_array[2]}" ]; then
        echo "Available power limit is ${pow_array[0]}"
        echo "Setting up ${pow_array[2]}"
    else
        echo "All good, setting up $1"
    fi
}
 
str_check "70"
str_check "100"
str_check "200"

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