Shell Programming and Scripting

Hello dear Unix shell professionals,
I am desperately trying to get a seemingly simple logic to work. I need to extract words from a text line and save them in an array. The text can look anything like that:

Code:

aaaaaaa${important}xxxxxxxx${important2}ooooooo${importantstring3}...

I am handicapped though in different regards:
My attempt was this:

Code:

line="aaaaaaa${important}xxxxxxxx${important2}ooooooo${importantstring3}";
if [[ $line =~ '(\${[^{]*})' ]]; 
    then
        echo "matching[1]: ${BASH_REMATCH[1]}";
        echo "matching[2]: ${BASH_REMATCH[2]}";
        echo "matching[3]: ${BASH_REMATCH[3]}";
    fi;

Output:

Code:

matching[1]: ${important}
matching[2]:
matching[3]:

So it prints the first match correctly, however it ignores all the remaining matches. Please anyone help me with this, I am stuck here for 2 days now . If it works with "awk", it should be fine too, but I can't figure out the syntax. Beware that I use a old shell.