Dear Sir or Madam,

I have a question like this. I want to extract the following data from the
square bracket:

   1            band            band            [0.86]
   2            band            band            [0.93]
   3            noband          noband          [0.95]
   4            noband          noband          [0.91]
   5            noband          noband          [0.89]
   6            noband          noband          [0.84]
   7            noband          noband          [0.89]
   8            band            noband          [0.80]
   9            band            band            [0.75]
  10            band            band            [0.93]

For the 4th column, I want to get the numerical values inside the bracket.
How can I use R code to implement this? Thanks.

Best,

Min

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