This is a good candidate for a one liner.

$ cat temp.txt | perl -ne 'print "$_\n" for /\[\d+\]\s*=\s*\d+/g'
[0] = 1
[1] = 2
[2] = 3
[3] = 4
[4] = 5
[5] = 6
[6] = 7
[7] = 8
[8] = 9
[9] = 10
[10] = 1
[11] = 2
[12] = 3
[13] = 4
[14] = 5
[15] = 6
[16] = 7
[17] = 8
[18] = 9
[19] = 10
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