Regular Expressions 101

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"
Data Source\s*=\s*|Server=tcp:(.*?),|;
"
1st Alternative
Data Source\s*=\s*
Data Source
matches the characters Data Source literally (case sensitive)
\s
matches any whitespace character (equivalent to [\r\n\t\f\v  ])
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
= matches the character = with index 6110 (3D16 or 758) literally (case sensitive)
\s
matches any whitespace character (equivalent to [\r\n\t\f\v  ])
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
2nd Alternative
Server=tcp:(.*?),
Server=tcp:
matches the characters Server=tcp: literally (case sensitive)
1st Capturing Group
(.*?)
.
matches any character (except for line terminators)
*? matches the previous token between zero and unlimited times, as few times as possible, expanding as needed (lazy)
, matches the character , with index 4410 (2C16 or 548) literally (case sensitive)
3rd Alternative
;
; matches the character ; with index 5910 (3B16 or 738) literally (case sensitive)
Your regular expression does not match the subject string.

Regular Expression
No Match

r"
"

Test String