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What are the right functions and formulas with the field calculator to delete "alphabet" or "number" inside a field?

Let me be clear. I want to be able to delete "alphabetic letters" or "numbers" inside my records (see the image). I've used replace, left, substr functions, but they don't make any difference between "alphabet" and "number".

enter image description here

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    Please edit your question to show us a sample on how the texts in the attribute table are look like. – ahmadhanb Sep 2 '20 at 23:27
  • when extracting apply: for integers use to_int(regexp_substr("field_name", '(\\d+)')) and for symbols to_string(regexp_substr("field_name", '[A-Za-z]+')). when deleting use regexp_replace()instead. – Taras Sep 4 '20 at 11:46
  • @Taras, your formulas are working!!! Tank you very much for your help. – Yems Sep 5 '20 at 16:01
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To split your field into subfiels, i.e. "alphabetic" or "numeric" apply:

for integers:

to_int(regexp_substr("field_name", '(\\d+)'))

that will give you '199' from '199 (ME)'

for symbols:

to_string(regexp_substr("field_name", '[A-Za-z]+'))

that will give you 'ME' from '199 (ME)'

References:

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