Regular Expressions 101

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"
TIMING ADVANCE.+(\d+)
"
TIMING ADVANCE
matches the characters TIMING ADVANCE literally (case sensitive)
.
matches any character (except for line terminators)
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
1st Capturing Group
(\d+)
\d
matches a digit (equivalent to [0-9])
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
Your regular expression does not match the subject string.

Regular Expression
No Match

r"
"

Test String