Log Message:
p5-PPIx-Regexp: update to 0.058.

0.058		2018-04-26	T. R. Wyant
    Prefer /[0-9]/ over /\d/ for numeric checks. The latter can match
    non-ASCII digits.

    Explain the negated POSIX character classes. Also tweak some of the
    asserted explanations -- mostly for readability and parallel
    construction with the negated explanations, but it turns out
    [[:digit:]] is NOT equivalent to [0-9].

0.057		2018-04-17	T. R. Wyant
    Allow ->asserts( 'a*' ). This modification actually allows wild
    cards in asserts() on all match semantic modifiers, but it is
    probably only useful in the case of 'a*', because that is the only
    one that can be doubled.

    Explain grouping structure as 'Grouping', not 'Capture or grouping'.

    Caret modifier was not turning off /n. This was complicated by the
    fact that (?^) was introduced in 5.13.6, but (?n) was not introduced
    until 5.21.8. The solution was to include -n in the expansion of the
    caret if and only if /n had been seen in the scope of the caret.

    Recognize caret in /(?^)x/.

    Acknowledge Regexp::Parsertron in SEE ALSO