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# From
$str1 = "ATC[TG]CC";
...
                'ATCTCC',
                'ATCGCC'
               ];

# From
$str2 = "ATCGC[ATCG]";
...
                'ATCGCC',
                'ATCGCG',
               ];

# From
$str3 = "ATCGCT";

# into 
$ans_of_str3 = [ 'ATCGCT' ];