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Extract values from square brackets

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Compilation time: 0,22 sec, absolute running time: 0,16 sec, cpu time: 0,14 sec, average memory usage: 18 Mb, average nr of threads: 4 
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'[2]' found at position 7
'[22]' found at position 25
'[111]' found at position 40
'[333]' found at position 53
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