Regular Expressions 101

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"
[^_]+_[^_]+\.xml$
"
gm
Match a single character not present in the list below
[^_]
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
_ matches the character _ with index 9510 (5F16 or 1378) literally (case sensitive)
_ matches the character _ with index 9510 (5F16 or 1378) literally (case sensitive)
Match a single character not present in the list below
[^_]
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
_ matches the character _ with index 9510 (5F16 or 1378) literally (case sensitive)
\. matches the character . with index 4610 (2E16 or 568) literally (case sensitive)
xml
matches the characters xml literally (case sensitive)
$ asserts position at the end of a line
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