Data::Dumper can't produce the output you desire. Behold: 
Bareword found where operator expected at -e line 3, near "] String0"
        (Missing operator before String0?)
Bareword found where operator expected at -e line 4, near "] String1"
        (Missing operator before String1?)
Bareword found where operator expected at -e line 5, near "] String2"
        (Missing operator before String2?)
Bareword found where operator expected at -e line 6, near "] String3"
        (Missing operator before String3?)
Bareword found where operator expected at -e line 7, near "] String4"
        (Missing operator before String4?)
Bareword found where operator expected at -e line 8, near "] String5"
        (Missing operator before String5?)
Bareword found where operator expected at -e line 9, near "] String6"
        (Missing operator before String6?)
Bareword found where operator expected at -e line 10, near "] String7"
        (Missing operator before String7?)
syntax error at -e line 3, near "] String0"
Execution of -e aborted due to compilation errors.

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To get all the matches from the m// operator, you need list context (which you already have), but also the /g option: 

my @matches = $initialStr =~ /\d+:\d+:\d+/g;

[download]

Or, to get closer to your desired output: 

my @matches = $initialStr =~ /\[ .*? \] \s* ( \[ .*? \] .* )/gx;

[download]
لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ

In reply to Re: regex remove blank/whitespace until first occurrence of specific character "[" by choroba
in thread regex remove blank/whitespace until first occurrence of specific character "[" by thanos1983

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