Message 64950 - Python tracker

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Author	jorendorff
Recipients	jorendorff, mark.dickinson
Date	2008-04-04.20:37:56
SpamBayes Score	0.14858255
Marked as misclassified	No
Message-id	<1207341537.41.0.695666739868.issue2537@psf.upfronthosting.co.za>
In-reply-to

Content
Huh. Maybe you're right. JavaScript, Ruby, and Perl all accept both regexes, although no two agree on what should be captured: js> "xyyzy".replace(/((x\|y))/, "($1, $2)") (xyy, y)zy js> "xyyzy".replace(/((x\|y+))/, "($1, $2)") (xyy, yy)zy >> "xyyzy".sub(/((x\|y))/, "(\\1, \\2)") => "(, y)zy" >> "xyyzy".sub(/((x\|y+))/, "(\\1, \\2)") => "(, yy)zy" DB<1> $_ = 'xyyzy'; s/((x\|y))/(\1 \2)/; print ( )zy DB<2> $_ = 'xyyzy'; s/((x\|y+))/(\1 \2)/; print ( yy)zy Ruby's behavior seems best to me.

Huh.  Maybe you're right.  JavaScript, Ruby, and Perl all accept both
regexes, although no two agree on what should be captured:

js> "xyyzy".replace(/((x|y)*)*/, "($1, $2)") 
(xyy, y)zy
js> "xyyzy".replace(/((x|y+)*)*/, "($1, $2)")
(xyy, yy)zy

>> "xyyzy".sub(/((x|y)*)*/, "(\\1, \\2)")
=> "(, y)zy"
>> "xyyzy".sub(/((x|y+)*)*/, "(\\1, \\2)")
=> "(, yy)zy"

  DB<1> $_ = 'xyyzy'; s/((x|y)*)*/(\1 \2)/; print
( )zy
  DB<2> $_ = 'xyyzy'; s/((x|y+)*)*/(\1 \2)/; print
( yy)zy

Ruby's behavior seems best to me.

History
Date	User	Action	Args
2008-04-04 20:38:57	jorendorff	set	spambayes_score: 0.148583 -> 0.14858255 recipients: + jorendorff, mark.dickinson
2008-04-04 20:38:57	jorendorff	set	spambayes_score: 0.148583 -> 0.148583 messageid: <1207341537.41.0.695666739868.issue2537@psf.upfronthosting.co.za>
2008-04-04 20:37:57	jorendorff	link	issue2537 messages
2008-04-04 20:37:56	jorendorff	create