How to convert formatted time to milliseconds?

Question

bash

The essence of the problem:
It is necessary to write a bash script that would translate the formatted date into milliseconds.
The input line is the following:
1 d 11 h 12 m 23 s
In principle, I found how to translate, but there is a difficulty with parsing the string.
I think that the algorithm is as follows:
1) remove spaces between 1 and d, 11 and h, etc. so that the output is 1d 11h 12m 23s
2) split the string into words and shove it into different variables or into an array
3) convert each component to milliseconds
4) add everything up and be happy)
Now I have problems with the 1st point and the 2nd.

Answer 1

It is possible like this:

#!/bin/bash

###
# ./str2msec.sh "1 d 11 h 12 m 23 s"
# 
# или так
# 
# echo "1 d 11 h 12 m 23 s" | xargs -0 ./str2msec.sh
###

argument="$1"
# Варианты аргументов:
#argument="1 d 11 h 12 m 23 s"
# or
#argument="1 d   12 m 23 s"
# or
#argument=" 11 h 23 s"
# or
#argument="11   hm 23"


## Убираем пробелы

data=${argument// /}
# Результат из примеров выше:
#data="1d11h12m23s"
# or
#data="1d12m23s"
# or
#data="11h23s"
# or
#data="11hm23"
echo
echo "data = $data"
echo

## Регуляркой делим на элементы
re='([0-9]+[d])?([0-9]+[h])?([0-9]+[m])?([0-9]+[s])?'

## Ищем совпадения и вычисляем
if ; then
    echo "BASH_REMATCH  = ${BASH_REMATCH}"
    echo "BASH_REMATCH1 = ${BASH_REMATCH[1]}"
    echo "BASH_REMATCH2 = ${BASH_REMATCH[2]}"
    echo "BASH_REMATCH3 = ${BASH_REMATCH[3]}"
    echo "BASH_REMATCH4 = ${BASH_REMATCH[4]}"

    days=$(( $((${BASH_REMATCH[1]%d})) * 24 * 60 * 60 * 1000 ))
    hours=$(( $((${BASH_REMATCH[2]%h})) * 60 * 60 * 1000 ))
    minutes=$(( $((${BASH_REMATCH[3]%m})) * 60 * 1000 ))
    seconds=$(( $((${BASH_REMATCH[4]%s})) * 1000 ))
    result=$(( ${days} + ${hours} + ${minutes} + ${seconds} ))
else
    echo "not matched"
    exit 1
fi

echo
echo "Result = $result msec"
echo

Answer 2

Is it the script on the bash? maybe date is enough?

Answer 3

1) You need to remove all spaces: 1d11h12m23s
2) (\d+[d|h|m|s])Divide the resulting “word” into elements by the expression. (For example, in a text editor, print each part of the "word" on a new line: \1\n)