UDF to handle + or - in string and divide

Hi Experts ,

      i need a udf to do the handle the following 3 types of data

  Data of the below 3 types can come , i need to remove + or - if any , divide it by 100 and then add + /- based on the input data type ..

  100-   = needs to convert to 1-

  500+ = needs to convert to 5+

  2000 = needs to convert to 20

Please suggest probable UDF . String length can vary .

Thanks and Regards,

Arnab