[issue2636] Regexp 2.7 (modifications to current re 2.2.2)

Russ Cox r...@swtch.com added the comment: Named Unicode characters eg \N{LATIN CAPITAL LETTER A} These descriptions are not as stable as, say, Unicode code point values or language names. Are you sure it is a good idea to depend on them not being adjusted in the future? It's certainly nice

[issue2650] re.escape should not escape underscore

Russ Cox [EMAIL PROTECTED] added the comment: Lorenz's patch uses a set, not a list for special characters. Set lookup is as fast as dict lookup, but a set takes less memory because it does not have to store dummy values. More importantly, use of frozenset instead of dict makes the code

[issue2650] re.escape should not escape underscore

Russ Cox [EMAIL PROTECTED] added the comment: You don't need to get so defensive. I did not raise a performance problem, I was simply responding to Rafael's AFAIK the lookup on dictionaries is faster than on lists comment. I did not say that you *should* rewrite your patch the way I

[issue2650] re.escape should not escape underscore

Russ Cox [EMAIL PROTECTED] added the comment: On Thu, May 8, 2008 at 12:12 PM, Alexander Belopolsky [EMAIL PROTECTED] wrote: Alexander Belopolsky [EMAIL PROTECTED] added the comment: On Thu, May 8, 2008 at 11:45 AM, Russ Cox [EMAIL PROTECTED] wrote: .. My argument is only that Python

[issue2650] re.escape should not escape underscore

Russ Cox [EMAIL PROTECTED] added the comment: The loop in escape should really use enumerate instead of for i in range(len(pattern)). It needs i to edit s[i]. Instead of using a loop, can't the test just use self.assertEqual(re.esacpe(same), same)? Done. Also, please add tests

[issue2636] Regexp 2.6 (modifications to current re 2.2.2)

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[issue2537] re.compile(r'((x|y+)*)*') should fail

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[issue1160] Medium size regexp crashes python

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[issue1662581] the re module can perform poorly: O(2**n) versus O(n**2)

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[issue433030] SRE: Atomic Grouping (?...) is not supported

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[issue1693050] \w not helpful for non-Roman scripts

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[issue1647489] zero-length match confuses re.finditer()

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[issue1297193] Search is to long with regex like ^(.+|dontmatch)*$

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[issue1721518] Small case which hangs

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[issue433024] SRE: (?flag) isn't properly scoped

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[issue2650] re.escape should not escape underscore

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[issue2650] re.escape should not escape underscore

New submission from Russ Cox [EMAIL PROTECTED]: import re print re.escape(_) Prints \_ but should be _. This behavior differs from Perl and other systems: _ is an identifier character and as such does not need to be escaped. -- messages: 65585 nosy: rsc severity: normal status: open

[issue2650] re.escape should not escape underscore

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[issue2650] re.escape should not escape underscore

Russ Cox [EMAIL PROTECTED] added the comment: It seems that escape is pretty dumb. The documentations says that re.escape escapes all non-alphanumeric characters, and it does that faithfully. It would seem more useful to have a list of meta-characters and just escape those. This is more true