Hi!
Does Pharo use the Regex11 package? If yes, has it already diverged from the
version shipped with VisualWorks?
The reason I am asking is that I just pushed an update to the public store. It
addresses a bug that prevented $[ to be used in a character class. For details,
see the excerpt below. Furthermore, you might have an opinion on allowing more
escape sequences in character classes, don't you?
Kind regards,
Steffen
----- Weitergeleitete Nachricht -----
Von: Steffen Märcker <merk...@web.de>
An: 'VWNC' <v...@cs.uiuc.edu>
Betreff: Re: [vwnc] Exception in Regex11 1.4.6
Datum: Thu Jun 24 2021 18:47:01 GMT+0200 (Mitteleuropäische Sommerzeit)
Hi!
I just published Regex11 version 1.4.7 with the following changes:
1. Fix: Character sets could not contain an opening bracket $[.
2. Fix: Character sets could not contain the characters '[:', e.g. as in
'[[:something]' asRegex.
I also provided additional tests for the improved functionality. I might tidy
the code a bit later in a minor version bump.
Just to note that Regex11 uses [[:xxx:]] as a special syntax, which might
interfere with attempts to allow [[] and []].
Indeed. If I did no mistake, the new version does not break this.
I agree with the idea to allow backslash escaping in character classes too,
with the default being that backslash followed by any character is parsed as
that character.
I also like the idea of allowing more backslash escaping in character classes.
However, I still have the bad feeling that this might change the semantics of
existing code. Hence, I refrained from implementing this right away until I am
more confident that this does not break other peoples stuff.
Currently only a few explicitly defined backslash escapes are recognized,
forcing the user to remember whether a given character can be used as-is in a
given context, or must be escaped.
A couple of gotchas (probably not applicable in a character set?):
\< an empty string at the beginning of a word
\> an empty string at the end of a word
Thanks, I'll keep them in mind and consider them when I decide to implement the
changes.
OT: I also noticed that repetition, e.g. '.{5}' behaves strange. For instance,
'.{{5}}' should match 'a{{{{{}' but it doesn't. Has anyone an opinion on that
one?
Best regards, Steffen
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