Regular Expressions 101

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"
(\S+://+\S*)
"
1st Capturing Group
(\S+://+\S*)
\S
matches any non-whitespace character (equivalent to [^\r\n\t\f\v ])
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
:/
matches the characters :/ literally (case sensitive)
/
matches the character / with index 4710 (2F16 or 578) literally (case sensitive)
\S
matches any non-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)
Your regular expression does not match the subject string.

Regular Expression
No Match

r"
"

Test String