lookbehind doesn't process newlines or respect start position

[burgerrg]

The regular expression '.*(?<!/)'.*' looks for strings with single quotes that have an internal single quote not preceded by a slash.

The following works as expected:

> (pregexp-match "'.*(?<!/)'.*'" "'/'fine'")
#f

Why does this happen?

> (pregexp-match "'.*(?<!/)'.*'" "\n'/'fine'")
("'/'fine'")

But it's fine with a non-newline:

> (pregexp-match "'.*(?<!/)'.*'" "\r'/'fine'")
#f

[burgerrg]

Here are tests that expose the bugs:

  (pregexp-match-positions "(?<=grey)hound"
    "\nthe hound in the picture is not a greyhound")
  ((39 . 44))

  (pregexp-match-positions "(?<!grey)hound"
    "\nthe greyhound in the picture is not a hound")
  ((39 . 44))

  (pregexp-match-positions "(?<=grey)hound"
    "greyhound"
    4)
  #f

  (pregexp-match-positions "(?<!grey)hound"
    "greyhound"
    4)
  ((4 . 9))

[burgerrg]

See pull request #3

[ds26gte]

Thank you! I've pushed a rather smaller fix 43fd6da that should address both the issues that you point out.

[burgerrg]

Looks good, thank you!