Regular Expressions 101

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"
[\/\\][^,:]*\.\w+
"
gm
Match a single character present in the list below
[\/\\]
\/ matches the character / with index 4710 (2F16 or 578) literally (case sensitive)
\\ matches the character \ with index 9210 (5C16 or 1348) literally (case sensitive)
Match a single character not present in the list below
[^,:]
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
,:
matches a single character in the list ,: (case sensitive)
\. matches the character . with index 4610 (2E16 or 568) literally (case sensitive)
\w
matches any word character (equivalent to [a-zA-Z0-9_])
+ 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