21.11.17 04:20, Stephen J. Turnbull пише:
Serhiy Storchaka writes: > I agree. But if there is a special part of the Unicode standard for > Pattern White Spaces which includes non-ASCII characters, perhaps there > is a need in them. I asked for the case if Python developers with very > different cultures have need in additional whitespaces in regular > expressions, but I don't know. Seems nobody has claimed their need.I doubt that Japanese would want it. I do use \N{IDEOGRAPHIC SPACE} a bit as a *target* of regular expressions, but I would never want it as non-syntactic in re.VERBOSE. (Of course, I'm not a native Japanese, but I have never heard a Japanese developer wish for use of that character in any programming language, outside of literal strings.) > In particularly I don't know how helpful would be supporting > right-to-left and left-to-right marks in verbose regular expressions That's a good question. Interpretation and display of R2L in programming constructs came up briefly in the discussions about BIDI on the emacs-devel list. I'll ask Eli Zaretskii, who implemented it for Emacs.
Thank you Stephen. I would prefer to not change anything (because supporting additional whitespaces will complicate and slow down the code, and can add subtle bugs, add likely will add a confusion for users). But I want to know whether there is a real need in supporting additional whitespaces and rtl and ltr marks in regular expressions and Python syntax.
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