Steffen

----- Weitergeleitete Nachricht -----
Von: Steffen M��rcker <merkste@web.de>
An: 'VWNC' <vwnc@cs.uiuc.edu>
Betreff: Re: [vwnc] Exception in Regex11 1.4.6
Datum: Thu Jun 24 2021 18:47:01 GMT+0200 (Mitteleurop��ische 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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