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The ( in the second case is taken by the parser as starting the argument list. When the [ is being parsed, it is already too late to change mind. You can use + to disambiguate:
print +("adf","ff","f")[1];
لսႽ ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ

In reply to Re: Getting single element from an array by choroba
in thread Getting single element from an array by gurpreetsingh13

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    [Corion]: Nicholas Clark++ # read for a multichar block-delimiter by scanning for the last char, and only then check whether the whole delimiter was read.
    [Corion]: At least if you're appending the data read to a larger buffer, this means you avoid the situation of "a delimiter was found but the other half has not been read yet"
    choroba misses the context
    [Corion]: choroba: Optimizing how Perl reads source code on startup (and then processes it line-by-line)
    [Corion]: But in general, it seems to be an interesting approach I should think about - whenever I'm searching for something, to consider if I could search for the end of the token instead of the start of the token

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