Re: [Pyparsing] C++ Comments and a Backslash at the End of the Line.

[Ralph C. <ra...@in...>]

Hi Paul,

> Care to try your hand at the re's for quoted strings?

OK.

    _escapedChar = Regex(r"\\.")

I don't think this is used anywhere?

    dblQuotedString = Regex(r'"([^"\n\r\\]|("")|(\\.))*"')

There's not much you can do about this.  Make it non-capturing.  Other
than that, attempting to match many [^"\n\r\\] at a time without going
outside the group will result in exponential behaviour on an
unterminated string because of backtracking.  See
http://www.regular-expressions.info/atomic.html

Unfortunately, Python's re module doesn't support Atomic Grouping or
Possessive Quantifiers, unlike, e.g. Perl.

Cheers,


Ralph.