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How can I remove the alphabets and show the numbers only in a label expression of a layer?

For example, I have a field with values: TK209, 01TKRW394, 045TK, 089EYZ46 and I want to display labels as: 209, 01394, 045, 08946 respectively.

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You can filter the string by digits using str.isdigit method. Change [Key] to the name of your field:

def FindLabel ( [Key] ):
  return filter(str.isdigit, str([Key]))

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