3 suggestions
- you don't need complete lines to make it work, but anchoring to line start might prove to be faster
- I'd include characters below ASCII 8 to the "marker" to play safe, see also discussion surrounding the similar $;
- you might be interested to check with re "debug" , how the backtracking of the .* submatch performs. I'd guess you prefer it to grow from right to left instead of shrinking from left to right. I know the regex engine can do this depending on the anchors.
I haven't checked the last point since performance might not be your biggest issue.
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