Power BI: How to  Extract only numbers from String?
To remove all characters and show only numbers in a string in Power BI, you should do the following:
Steps
- At the - Hometab, click on- "Edit Queries".
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- The Power Query Editorwould be Opened.
- From the left side, Select your table.
- At the - Add columntab, click on- Custom Column.
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- Write the below formula based on your column name. 
Using Text.Select()
You can use Text.Select() to extract only numbers from a string in Power BI 
= Text.Select([String],{"0".."9"})

Using Text.Remove()
Also, You can use Text.Remove() to extract only numbers from a string in Power BI 
= Text.Remove([String],{"A".."z"})
Output

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