VM replaceAll with "^" RegExp doesn't work

[nex3]

Consider the following code:

   "foo\nbar\nbaz".replaceAll(const RegExp("^", multiLine: true), " ")

This is expected to return " foo\n bar\n baz". It does so in Frog, but in the VM it returns " foo\n bar\n baz". I'm not sure where the extra whitespace is coming from.

[iposva-google]

Carl, can you please verify why we have a difference here?

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[lexprfuncall]

The list of matches seems to repeat subsequent matches when the multiline flag is set. If I print out each start, end pair returned by allMatches here is what I see

match=[0, 0]
match=[4, 4]
match=[4, 4]
match=[4, 4]
match=[4, 4]
match=[8, 8]
match=[8, 8]
match=[8, 8]
match=[8, 8]

This suggests something is going wrong in the native glue or below it, somewhere.

[iposva-google]

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[iposva-google]

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[iposva-google]

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[lrhn]

The number of extra matches depends on the number of characters before. A quick guess is that the start-position is being incremented by 1, instead of set to after the previous match.
Since this is a zero-width match, the problem is probably in the code handling that special case - it sets the next position to the start-position + 1, not the end-position + 1.

[lrhn]

I was already touching that code anyway.

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[lrhn]

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