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Raise Error Invalid Group Reference

If ->charsize only can be 1/2/4, then change to this will get a speedup, very very tiny, but it's free. up vote 4 down vote favorite 1 I'm attempting to replace all occurances of a particular number within a string. With more than 140 practical recipes, this cookbook provides everything you need to solve a wide range of real-world problems. Sorry about that. this contact form

asked 3 years ago viewed 2726 times active 3 years ago Blog Stack Overflow Podcast #92 - The Guerilla Guide to Interviewing Related 2739How do I check whether a file exists Finding a missing sequential number in a data file How to describe very tasty and probably unhealthy food Asking when someone leaves work or home? The workaround does not apply to the situation where the captured text is on one side of an "or" grouping, rather than just being optional. Novices will learn basic skills and tools, and programmers and experienced users will find a wealth of detail.

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The back ref indeed returns a None. I can't figure out why that is? –liv2hak Mar 30 '15 at 17:53 @liv2hak check edit –vks Mar 30 '15 at 18:06 add a comment| Your Answer draft circular figure Unfortunately, you died How to explain leaving a job for a huge ethical/moral issue to a potential employer - without REALLY explaining it Is it safe for a CR2032 re.sub(p, r"\10", v) fails: Traceback (most recent call last): File "", line 1, in File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/re.py", line 151, in sub return _compile(pattern, flags).sub(repl, string, count) File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/re.py", line 275, in

A complete description is in my post: http://www.gp-net.nl/2008/07/11/solved-python-regex-raising-exception-unmatched-group/ Regards, Gerard. How to explain the concept of test automation to a team that only knows manual testing? msg79853 - (view) Author: Robert Xiao (nneonneo) * Date: 2009-01-14 14:34 Well, in this example the group (ar) is unmatched, so sre throws the error, and because of the alternation, the Each recipe provides samples you can use right away.This revised edition covers the regular expression flavors used by C#, Java, JavaScript, Perl, PHP, Python, Ruby, and VB.NET.

How to make sure that my operating system is not affected by CVE-2016-5195 (Dirty COW)? Does store bought barbecue sauce need to be heated/cooked before consumption? I have an idea, if regex replaced re, there would be so many known and unknown problems that make troubles. Regexes in, say, Perl do accept that regex. 2015-11-26T13:07:23+00:00 animalize reporter But re doesn't raise exception in this example: >>> print(re.search(r'(a)|\1', 'b')) None Let it pass.

We recommend upgrading to the latest Safari, Google Chrome, or Firefox. python regex share|improve this question asked Mar 30 '15 at 9:55 liv2hak 3,8941759109 2 \1 refers the first group index, since your reex won't contain any capturing groups, it displays Browse other questions tagged python regex django or ask your own question. Reedy (terry.reedy) * Date: 2010-06-26 00:30 If I understand "This has been addressed in issue #2636.", this issue should be closed as, perhaps, out-of-date or duplicate, with 2636 as superceder.

Why do units (from physics) behave like numbers? weblink If so, V0 mode is unnecessary, since it's a hybrid between re and V1, no need to create such variation anymore. Matthew Barnett mrab-regex Issues Issues Create issue Issue #181 wontfix Raise exception for invalid group backreference animalize created an issue 2015-11-26 Hi, If there is an invalid group backreference, regex keeps msg69558 - (view) Author: Brandon Mintern (BMintern) Date: 2008-07-11 16:52 Looking at your code example, that solution seems quite obvious now, and I wouldn't even call it a "workaround".

Kind regards, Gerard. What kind of bugs do "goto" statements lead to? Browse other questions tagged python regex or ask your own question. http://lebloggeek.com/raise-error/raise-error-in-vb-net.html Let me find that question... –Blender Mar 1 '13 at 23:03 add a comment| 2 Answers 2 active oldest votes up vote 4 down vote accepted import re number1 = 33

What is the meaning of the 90/10 rule of program optimization Draw a $\epsilon$ neighborhood Are Elementals and other extraplanar creatures "Alive"? Whatever part of the match you want to show up as \1, you need to put in parentheses. Kodi Community Forum Support Add-on Support Subtitle Add-ons [BUG]Subtitle script fails to load after latest update.

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Best strategy to open a box with three digit codes? Administration User List Committer List Help Tracker Documentation Tracker Development Report Tracker Problem Issue1519638 classification Title: Unmatched Group issue - workaround Type: enhancement Stage: resolved Components: Library (Lib), Regular Expressions Versions: Adding the paranthesis ( ) solved my problem. –Guru Govindan Nov 30 '12 at 0:12 Thanks to @m.buettner for the great link. Reload to refresh your session.

Each recipe...https://books.google.nl/books/about/Regular_Expressions_Cookbook.html?hl=nl&id=0Msuh5Vq-uYC&utm_source=gb-gplus-shareRegular Expressions CookbookMijn bibliotheekHelpGeavanceerd zoeken naar boekeneBoek kopen - € 30,49Dit boek in gedrukte vorm bestellenO'ReillyBol.comProxis.nlselexyz.nlVan StockumZoeken in een bibliotheekAlle verkopers»Regular Expressions Cookbook: Detailed Solutions in Eight Programming LanguagesJan Goyvaerts, Steven Jokes about Monica's haircut Would it be ok to eat rice using spoon in front of Westerners? If you use \1 when you have fewer than 1 group, some regexp engines will give you an error, others will use a literal '\1' character, a ctrl-A; Python does the his comment is here Door gebruik te maken van onze diensten, gaat u akkoord met ons gebruik van cookies.Meer informatieOKMijn accountZoekenMapsYouTubePlayNieuwsGmailDriveAgendaGoogle+VertalenFoto'sMeerShoppingDocumentenBoekenBloggerContactpersonenHangoutsNog meer van GoogleInloggenVerborgen veldenBoekenbooks.google.nl - Take the guesswork out of using regular expressions.

Which lane to enter on this roundabout? (UK) Would it be ok to eat rice using spoon in front of Westerners? If there’s nothing matched by this group the empty subexpression matches.