start=0 passed to substring$

[Former user]

pybtex returns error message "start=0 passed to substring$" if starting characters position in substring$ is "0", but bibtex allows it.

so, pybtex should do the same.

example1: "string" #0 #1 substring$ top$ prints "" (empty string)

example2: "string" #1 #1 substring$ top$ prints "s"

[Andrey Golovizin]

- status: open --> closed-fixed

[Andrey Golovizin]

Thanks, fixed.