How to remove everything from string except what's inside square brackets?

Question

Heidi Mäkitalo 2019-7-12

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/471404-how-to-remove-everything-from-string-except-what-s-inside-square-brackets

编辑： Stephen23 2019-7-12

I have this cell array:

    {'0,11:1.03 SPEED MEASURED 1 [rpm]'}
    {'0,12:1.03 SPEED MEASURED 1 [rpm]'}
    {'0,13:1.03 SPEED MEASURED 1 [rpm]'}
    {'0,14:1.03 SPEED MEASURED 1 [rpm]'}
    {'0,11:1.06 MOTOR CURRENT [A]'     }
    {'0,12:1.06 MOTOR CURRENT [A]'     }
    {'0,13:1.06 MOTOR CURRENT [A]'     }
    {'0,14:1.06 MOTOR CURRENT [A]'     }
    {'0,11:2.13 TORQ USED REF [%]'     }
    {'0,12:2.13 TORQ USED REF [%]'     }
    {'0,13:2.13 TORQ USED REF [%]'     }
    {'0,14:2.13 TORQ USED REF [%]'     }
    {'0,11:1.08 MOTOR TORQUE [%]'      }
    {'0,12:1.08 MOTOR TORQUE [%]'      }
    {'0,13:1.08 MOTOR TORQUE [%]'      }
    {'0,14:1.08 MOTOR TORQUE [%]'      }
    {'0,11:2.10 TORQUE REF 3 [%]'      }
    {'0,12:2.10 TORQUE REF 3 [%]'      }
    {'0,13:2.10 TORQUE REF 3 [%]'      }
    {'0,14:2.10 TORQUE REF 3 [%]'      } 

How can I get the unit from between the brackets in each string, so that I'm left with the following:

    {'rpm'}
    {'rpm'}
    {'rpm'}
    {'rpm'}
    {'A'  }
    {'A'  }
    ...
    {'%'  }

Thanks!

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Akira Agata 2019-7-12

How about extractBetween function?

Heidi Mäkitalo 2019-7-12

Wow, I never even knew about this function! Very intuitive and seems to work just as well as regexp. Are there any benefits to using extractBetween other than the fact that it's more easy to use for this purpose?

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Answer 1

Stephen23 2019-7-12

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/471404-how-to-remove-everything-from-string-except-what-s-inside-square-brackets#answer_382972

编辑：Stephen23 2019-7-12

在 MATLAB Online 中打开

Where C is your cell array:

>> D = regexp(C,'\[(.+)\]','tokens','once')
>> D = vertcat(D{:})
D = 
    'rpm'
    'rpm'
    'rpm'
    'rpm'
    'A'
    'A'
    'A'
    'A'
    '%'
    '%'
    '%'
    '%'
    '%'
    '%'
    '%'
    '%'
    '%'
    '%'
    '%'
    '%'