# that didn't work: @array1 = map { s/INVITE:// } @array;

In the code above you collect results of s/// operator, i.e. number of successful substitutions, which is not what you want. You want the content of $_ after substitution. And thus, you have to do this instead:

@array1 = map { s/INVITE://; $_ } @array;
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... which indeed does work quiet nicely :)

BR

Update: expanded explanation about return value of s/// operator.