Recommended way to compare / work with substrings?

[Samuel Lampa]

What is the recommended way to compare substrings (even of one character 
long)?

I was wondering whetherI'm missing something when doing [1]:
!(cast(string)myString[0..1] == ">"

?

BR
// Samuel


[1] Longer context:

string sequence = "";
File file = File("some_file_with_dna_sequences.txt","r");
while (!file.eof()) {
    string line = chomp(file.readln());
    if (line.length > 0 && !(cast(string)line[0..1] == ">")) {
        sequence ~= line;
    }
}