RE notes: A few things to take note of since it seems that you may include those qualifiers on all matches which are not always needed or wanted.

s/://gosix
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• The o says to only compile the RE once which is the case anyway since the pattern is a literal.
• the s folds lines in the match to one big line making . match \n which in this match a noop.
• the i makes the match case insensitive which slows down the match. Additionally, the : is not affected by case.
• the x allows comments to be included in the match none of which have been included.
• as noted before tr/://d ( or y/://d ) is much more efficient to eliminate or change single characters.

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