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  • Why is '\x' invalid in Python?

    - by Paul McGuire
    I was experimenting with '\' characters, using '\a\b\c...' just to enumerate for myself which characters Python interprets as control characters, and to what. Here's what I found: \a - BELL \b - BACKSPACE \f - FORMFEED \n - LINEFEED \r - RETURN \t - TAB \v - VERTICAL TAB Most of the other characters I tried, '\g', '\s', etc. just evaluate to the 2-character string of a backslash and the given character. I understand this is intentional, and makes sense to me. But '\x' is a problem. When my script reaches this source line: val = "\x" I get: ValueError: invalid \x escape What is so special about '\x'? Why is it treated differently from the other non-escaped characters?

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  • Apache and backslashes in mod_rewrite

    - by NuCalTone
    I want to process all incoming requests through a single script (index.php in web-root). So, the following is what currently happens: http://localhost/foo/bar/baz Is routed by Apache (through .htaccess) to: http://localhost/index.php?url=foo/bar/baz This works well, however, in Firefox I am able to do this: http://localhost/foo\ - notice the backslash. And Apache, instead of doing: /index.php?url=foo\ Emits a generic error page saying: Object not found! The requested URL was not found on this server. If you entered the URL manually please check your spelling and try again. If you think this is a server error, please contact the webmaster. Error 404 localhost Apache/2.2.14 (Win32) DAV/2 mod_ssl/2.2.14 OpenSSL/0.9.8l mod_autoindex_color PHP/5.3.1 mod_apreq2-20090110/2.7.1 mod_perl/2.0.4 Perl/v5.10.1 Directly going to: http://localhost/index.php?url=foo\ works without issues, however. All the sites that I've seen on the internet seem to be able to handle backslashes gracefully (e.g., http://stackoverflow.com/tags/php\\\\\). I consider this behavior a bug and I want to force Apache to forward backslashes correctly. Here's my .htaccess file in its entirety: RewriteEngine On RewriteCond %{REQUEST_FILENAME} !-f RewriteRule ^(.*)$ index.php?url=$1 [L] How can I make this work properly?

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  • Ruby -- looking for some sort of "Regexp unescape" method

    - by RubyNoobie
    I have a bunch of strings that appear to have been double-escaped -- eg, I have "\\014\"\\000\"\\016smoothing\"\\011mean\"\\022color\"\\011zero@\\016" but I want "\014"\000"\016smoothing"\011mean"\022color"\011zero@\016" Is there a method I can use to unescape them? I imagine that I could make a regex to remove 1 backslash from every consecutive n backslashes, but I don't have a lot of regex experience and it seems there ought to be a "more elegant" way to do it. For example, when I puts MyString it displays the output I'd like, but I don't know how I might capture that into a variable. Thanks! Edited to add context: I have this class that is being used to marshal / restore some stuff, but when I restore some old strings it spits out a type error which I've determined is because they weren't -- for some inexplicable reason -- stored as base64. They instead appear to be 'double-escaped', when I need them to be 'single-escaped' to get restored. require 'base64' class MarshaledStuff < ActiveRecord::Base validates_presence_of :marshaled_obj def contents obj = self.marshaled_obj return Marshal.restore(Base64.decode64(obj)) end def contents=(newcontents) self.marshaled_obj = Base64.encode64(Marshal.dump(newcontents)) end end

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  • Safely escaping and reading back a file path in ruby

    - by user336851
    I need to save a few informations about some files. Nothing too fancy so I thought I would go with a simple one line per item text file. Something like this : # write io.print "%i %s %s\n" % [File.mtime(fname), fname, Digest::SHA1.file(fname).hexdigest] # read io.each do |line| mtime, name, hash = line.scanf "%i %s %s" end Of course this doesn't work because a file name can contain spaces (breaking scanf) and line breaks (breaking IO#each). The line break problem can be avoided by dropping the use of each and going with a bunch of gets(' ') while not io.eof? mtime = Time.at(io.gets(" ").to_i) name = io.gets " " hash = io.gets "\n" end Dealing with spaces in the names is another matter. Now we need to do some escaping. note : I like space as a record delimiter but I'd have no issue changing it for one easier to use. In the case of filenames though, the only one that could help is ascii nul "\0" but a nul delimited file isn't really a text file anymore... I initially had a wall of text detailing the iterations of my struggle to make a correct escaping function and its reciprocal but it was just boring and not really useful. I'll just give you the final result: def write_name(io, val) io << val.gsub(/([\\ ])/, "\\\\\\1") # yes that' 6 backslashes ! end def read_name(io) name, continued = "", true while continued continued = false name += io.gets(' ').gsub(/\\(.)/) do |c| if c=="\\\\" "\\" elsif c=="\\ " continued=true " " else raise "unexpected backslash escape : %p (%s %i)" % [c, io.path, io.pos] end end end return name.chomp(' ') end I'm not happy at all with read_name. Way too long and akward, I feel it shouldn't be that hard. While trying to make this work I tried to come up with other ways : the bittorrent encoded / php serialize way : prefix the file name with the length of the name then just io.read(name_len.to_i). It works but it's a real pita to edit the file by hand. At this point we're halfway to a binary format. String#inspect : This one looks expressly made for that purpose ! Except it seems like the only way to get the value back is through eval. I hate the idea of eval-ing a string I didn't generate from trusted data. So. Opinions ? Isn't there some lib which can do all this ? Am I missing something obvious ? How would you do that ?

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  • Javascript and backslashes replace

    - by Frankie
    here is my string: var str = "This is my \string"; This is my code: var replaced = str.replace("/\\/", "\\\\"); I can't get my output to be: "This is my \\string" I have tried every combination I can think of for the regular expression and the replacement value. Any help is appreciated!

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  • .NET PostSubmitter sends backslashes

    - by Stefan N.
    Hi, I'm using C# to send JSON to a PHP-Script, like this: string json = "{"; json += "\"prop\":\"some text\""; json += "}"; PostSubmitter post = new PostSubmitter(); post.Url = "http://localhost/synch/notein.php"; post.Type = PostSubmitter.PostTypeEnum.Post; post.PostItems.Add("note", json); post.Post(); Of course I'll have to escape the inner quotes, but they get sended to the script! To make things worse: There is text, which already has quotation marks, so those must be escaped to be valid JSON. In this case I want the backslashes to be transmitted. Any idea to accomplish this?

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  • Converting rich text that contains backslashes to plain text or html

    - by Allison
    I am trying to convert a rich text string to plain text or html. I am currently using the RichTextBox.Text feature which works correctly for almost all cases except when the text contains backslashes then some of the text is stripped out as the converter believes that it is part of the rtf formatting. Does anyone have any ideas of how to get the backslashes to stay in that instance. Here is an example of a string I would have {\rtf1\ansi\ansicpg1252\deff0\deflang1033{\fonttbl{\f0\fnil\fcharset0 Arial;}}\viewkind4\uc1\pard\fs17 Testing Export \with comments\par} The text I would need would be "Testing Export \with comments" and the text I am getting back from the rtf converter is "Testing Export comments". Any help would be greatly appreciated. Please respond if you have further questions.

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  • C# - retrieve file path from config file - @ doesn't do it's magic

    - by Bart
    Hi guys, I'm currently working on a web service that retrieves an XML message, archives it and then processes it further. The archive folder is read from the Web.config. This is what the archive method looks like private void Archive(System.Xml.XmlDocument xmlDocument) { try { string directory = System.Configuration.ConfigurationManager.AppSettings.Get("ArchivePath"); ParseMessage(xmlDocument); directory = string.Format(@"{0}\{1}\{2}", @directory, _senderService, DateTime.Now.ToString("MMMyyyy")); System.IO.Directory.CreateDirectory(directory); string Id = _messageID; string senderService = _senderService; xmlDocument.Save(directory + @"\" + DateTime.Now.ToString("yyyyMMdd_") + Id + "_" + System.Guid.NewGuid().ToString().Substring(0, 13) + ".xml"); } The path structure I retrieve is C:\Program Files\Subfolder\Subfolder. In the development, QA, UAT and PRD environments everything works fine. But on another machine I now need to install the web service on (which I cannot debug, unfortunately), the directory string is 'C:Files'. Just to be sure I double checked the .NET version on the different machines (I thought perhaps the usage of @ before a string was version-dependent); all machines use 2.0.50727. Does anyone recognize this problem? Thanks in advance!

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  • Writing a regex in Latex

    - by Harm De Weirdt
    Hello everyone. In a Latex Report I am making I have to write a regex. There is only one in the whole report, so I don't really want to use packages and so on. This is the regex I am talking about: ^\"((\w|\s)+)\"$ I came up with this for Latex: \grave{ }\backslash\"'((\backslash w\| \backslash s)+)\backslash \"' \backslash \$ This gives me like 10 errors, and I can't really see what is wrong. Okay, it looks pretty bad but all the commands should work.. Thanks in advance, Harm

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  • How to delete a file that contains a backslash in the name under Windows 7?

    - by espinchi
    I want to delete a file named workspaces\google-gson-1.7.1-release.zip Yep, it contains a backslash in the name. Here it is: G:\>dir Z_DRIVE Volume in drive G is samsung Volume Serial Number is 48B9-7E1D Directory of G:\Z_DRIVE 04/06/2012 08:09 PM <DIR> . 04/06/2012 08:09 PM <DIR> .. 05/01/2011 02:21 PM 528,016 workspaces\google-gson-1.7.1-release.zip 1 File(s) 528,016 bytes 2 Dir(s) 88,400,478,208 bytes free The first attempt is to just delete it from the Windows Explorer, but it says it can't find the file. Then, I tried from the command line: G:\>del Z_DRIVE\workspaces\google-gson-1.7.1-release.zip The system cannot find the file specified. And, after researching a bit in the internets, I also tried the following, with no luck: G:\>del \\?\G:\Z_DRIVE\workspaces\google-gson-1.7.1-release.zip The system cannot find the file specified. Other than booting from some Linux CD, is there a way to get rid of this file? Update: also tried the following combinations, but the error is the same: G:\>del "\\?\G:\Z_DRIVE\workspaces\google-gson-1.7.1-release.zip" G:\Z_DRIVE>del workspaces\google-gson-1.7.1-release.zip G:\Z_DRIVE>del "workspaces\google-gson-1.7.1-release.zip" G:\Z_DRIVE>del workspaces*google-gson-1.7.1-release.zip

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  • Can backslash be encoded correctly in URL with URL rewrite?

    - by Millionbonus
    I am working on a ASP.NET MVC2 project. The problem is when a string which would be rewritten into URL that contains special character such as backslash or question mark. That will make URL wrong, even I have encoded it before. For example: 1. I have a product id "p001/2-2". 2. I encoded it into "p001%252f2-2" 3. The URL http://domain.com/ProductView/p001%252f2-2 will response HTTP Error 400 - Bad Request. How can I get it correct?

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  • PHP 5.3 Namespaces should i use every PHP function with backslash?

    - by lhwparis
    Hi, im now using namespaces in PHP 5.3 now there is a fallback mechanism for functions which dont exist in the namespace. so php every time checks if the function exists in namespace and then tries to load it from global space. So what about all php internal functions? strstr for example? Should i now use every php internal function with a \ ? to avoid php first checking the namespace? is this fallback a huge performance drop? what do you think?

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  • VMWare Workstation 8 can't find the headers directory

    - by BackSlash
    I'm having an issue with VMware Workstation 8. I installed it but when i run it, it shows this window: But, when I press on "Browse", this window comes up Even if I select the linux-headers-3.8.0-31-generic folder, it says that it can't find the C headers for that kernel. Why? P.S. I already tried sudo apt-get install linux-headers-3.8.0-31-generic and the terminal says that the kernel is up to date.

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  • strsplit in R with metacharacter

    - by user1429852
    I have received a large amount of data where the delimiter is a backslash (obviously a bad choice). I'm processing it in R for computation, and having a hard time finding how to split the string since the backslash is a metacharacter. For example, a string would look like this: "1128\0019\XA5\E2R\366\00=15" and I want to split it along the "\" character, but when I run the strsplit command: strsplit(tempStr, "\") Error in strsplit(tempStr, "\") : invalid regular expression '\', reason 'Trailing backslash' When I try to used the "fixed" option, it does not run because it is expecting something after the backslash: strsplit(tempStr, "\", fixed = TRUE) Unfortunately, I can't preprocess the data with another program because the data is generated daily. Please help and thanks!

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  • Interpreting regular expressions using find in Linux confusion

    - by PeanutsMonkey
    I am attempting to use the find command and came across an article at http://www.linux.ie/newusers/beginners-linux-guide/find.php which states The wildcard character is escaped with a slash so BASH sends a literal asterisk to the find utility as an argument instead of performing filename expansion and passing any number of files in as arguments. for the command find . -name up\*. Being new to the world of Linux I don't quite understand how the use of a backslash which is meant to escape the meta character * is interpreted and returns results as though as it is being passed to find. Does it mean if I use the -name option I have to use a backslash to pass a wildcard and if I don't use -name I don't have to use a backslash?

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  • Searching for literal "> \" using ack-grep

    - by Stephen Gornick
    I am looking for lines that literally have a greater than character (a "") followed by a space followed by a backslash character (a "\") i.e., a line with this: \ I thought escaping would allow this, and for the greater-than it does: $ ack-grep " " returns lines that have " " in them. But when I try to escape the backslash as well I get: $ ack-grep " \" ack-grep: Invalid regex ' \': Trailing \ in regex m/ \/

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  • Logitech keboard wrong keys under MAC OSX

    - by David Casillas
    I have a Logitech MK250 keyboard I use with my Macbook. One day the "minor/mayor than" and the "back slash" keys flip their functionality, so I have to hit "backslash" to get a "minor than" symbol and press the "alt + minor than" key to get the "backslash". Is there any way to reverse this annoying behavior? I often switch to Windows, where the keys work the expected way, and I'm always missing the right key.

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  • In bash, how do I escape an exclamation mark?

    - by Matthew
    I want to do something like bzr commit -m "It works!". I can sort of escape the exclamation mark by doing bzr commit -m "It works\!". However, then my commit message includes the backslash. How do I escape the exclamation mark, while still ignoring the backslash?

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  • Installing SQL Server Compact 3.5 SP2 *after* installing SQL 2012 RC0 - machine.config path include double slashes?

    - by Sigmund
    I'm trying to install SQL Compact 3.5 SP2 after I've installed SQL 2012 RC0, on a x64 Windows 7. The x86 installer goes through fine. The x64 installer fails, with the error: "Error 25543.Failed to save changes to XML file c:\Windows\Microsoft.NET\Framework64\v4.0.30319\CONFIG\machine.config, system error: -2147024864" Note the \CONFIG (double backslash) where there should be a single backslash... any ideas why this is happening and how to solve it?

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  • regex to match postgresql bytea

    - by filiprem
    In PostgreSQL, there is a BLOB datatype called bytea. It's just an array of bytes. bytea literals are output in the following way: '\\037\\213\\010\\010\\005`Us\\000\\0001.fp3\'\\223\\222%' See PostgreSQL docs for full definition of the format. I'm trying to construct a Perl regular expression which will match any such string. It should also match standard ANSI SQL string literals, like 'Joe', 'Joe''s Mom', 'Fish Called ''Wendy''' It should also match backslash-escaped variant: 'Joe\'s Mom', . First aproach (shown below) works only for some bytea representations. s{ ' # Opening apostrophe (?: # Start group [^\\\'] # Anything but a backslash or an apostrophe | # or \\ . # Backslash and anything | # or \'\' # Double apostrophe )* # End of group ' # Closing apostrophe }{LITERAL_REPLACED}xgo; For other (longer ones, with many escaped apostrophes, Perl gives such warning: Complex regular subexpression recursion limit (32766) exceeded at ./sqa.pl line 33, < line 1. So I am looking for a better (but still regex-based) solution, it probably requires some regex alchemy (avoiding backreferences and all).

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  • regex for matching strings that have illegal filename characters.

    - by cchampion
    I been trying to figure out how this blasted regex for two hours!!! It's midnight I gotta figure this out and go to bed!!! String str = new String("filename\\"); if(str.matches(".*[?/<>|*:\"{\\}].*")) { System.out.println("match"); }else { System.out.println("no match"); } ".*[?/<>|*:\"{\\}].*" is my regex expression. It catches everything correctly except the backslash!!! I need to know how to make it catch the backslash correctly please help! FYI, the illegal characters i'm trying to catch are ? \ / < | * : " I've got it working exception for the backslash

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  • Use string as input to re.compile

    - by williamx
    I want to use a variable in a regex, like this: variables = ['variableA','variableB'] for i in range(len(variables)): regex = r"'('+variables[i]+')[:|=|\(](-?\d+(?:\.\d+)?)(?:\))?'" pattern_variable = re.compile(regex) match = re.search(pattern_variable, line) The problem is that python adds an extra backslash character for each backslash character in my regex string (ipython), and makes my regex invalid: In [76]: regex Out[76]: "'('+variables[i]+')[:|=|\\(](-?\\d+(?:\\.\\d+)?)(?:\\))?'" Any tips on how I can avoid this?

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  • Java equivalent of C# @

    - by Simon Rigby
    Hi all, Quick question. Is there an equivalent of @ as applied to strings in Java: For example I can do @"c:\afolder\afile" in C# and have it ignore the escape characters when processing instead of having to do "c:\afolder\aFile". Is there a Java equivalent? hmmm: stackoverflow is escaping on me .. lol. The second example should read: c:(double-backslash)afolder(double-backslash)aFile

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