how to cut the pattern from a multiple line string and store to the new variable?

Question

I have a string variable

$var="-- this is a  --
      -- comment --
      hellow
      world"

i need to cut the string string into two parts such that there are two new string variable

$var1="-- this is a  --
      -- comment --"

$var2="hellow
       world" 

i need the new line as it is in the $var1 $var2

what i have tried

var2=$(echo $var | sed 's/^--.*--//g')

i am not able to store the pattern in $var1 that it is deleting .

Note : hyphen is important and new line is important to maintain . have tried bash string manipulation but it doesn't worked

Answer 1

Simply use grep

For var1

 grep  '\-\-.*\-\-'

For var2

 grep -v '\-\-.*\-\-'

As suggest by @123, we don't need escaping, if we use -- in grep command.

So you can use this as well

For var1

 grep  -- '--.*--'

For var2

 grep -v '--.*--'