Excluding pattern from regex

[TheVig]

1. this is text with //a comment

2. this is text with a link http://example.com


Looking for the to correct regular expression to remove from "//" to the end of the line in #1 but not remove "//" to the end of the line in #2

Thanks,
Jim

Edit:

Code:

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s.replacerx("(?<!http:)//.*\r\n")