troubleshooting Question

Python negative lookahead for aaa:bbb@hostname

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EK 365 asked on
Regular ExpressionsPython
6 Comments1 Solution327 ViewsLast Modified:
Hi, below python regular expression is for getting id/pwd/hostname/port from user input.

Python Re:

Target String:

Could you please explain above bold formatted characters' roles ?
I am not sure why (:?) has parenthesis however :? before "port" parsing does not have one.
I am not sure why (?!\\) was used why do we need negative look-ahead for '\' ? It works without (?!\\) regex.

Regular Expression tool:
Code used:
Dan Craciun
IT Consultant

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