Regular Expressions 101

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"
AC\d{8}|(\d+)
"
gm
1st Alternative
AC\d{8}
AC
matches the characters AC literally (case sensitive)
\d
matches a digit (equivalent to [0-9])
{8} matches the previous token exactly 8 times
2nd Alternative
(\d+)
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)
Global pattern flags
g modifier: global. All matches (don't return after first match)
m modifier: multi line. Causes ^ and $ to match the begin/end of each line (not only begin/end of string)
Your regular expression does not match the subject string.

Regular Expression
No Match

r"
"
gm

Test String

Code Generator

Generated Code

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For a full regex reference for Python, please visit: https://docs.python.org/3/library/re.html