boost::u32regex_replace() behavior when the string has a closing newline

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Assessment

Difficulty
3/5
Estimated time
1-2 days
Newbie friendliness
45/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Stale
Tech stack
cpp
Domain
tooling

Research direction

Start with the provided code.txt reproduction and output.txt, then inspect boost::u32regex_replace() behavior for the input ending in a newline and the pattern ^(.*)$. Compare the observed two substitutions with the expected matching semantics; done means determining whether the result is correct and documenting or fixing the behavior accordingly.

Written by the indexing model from the issue text.

Description

It seems that boost::u32regex_replace() matches a newline with ^(.*)$ different when it is at the end of a string and not within the string.

Input: "line\nline\nline\n"
Regular expression: "^(.*)$"
Format: "Hallo\1"
Result: "Halloline\nline\nline\nHallo

Is this example intended to result in two matches and substitutions?

code.txt
output.txt

Dominant language
C++
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