Google BigQuery extract string from column with regexp_extract

Question

I need to extract the app_id from the following string in the column below:

&app_id=4.25.9&

so anything that starts with &app_id= and ends with &

Any ideas on how to write this example? The number of characters and symbols may differ.

Answer 1

This should be sufficient:

REGEXP_EXTRACT(your_column, r'\&app_id=(.+?)\&')

The app id matching right now .+? is a little broad and will match any character, you may want to restrict it further.