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• Nullability (Regular Expressions)

  - by danportin

  In Brzozowski's "Derivatives of Regular Expressions" and elsewhere, the function d(R) returning ? if a R is nullable, and Ø otherwise, includes clauses such as the following: d(R1 + R2) = d(R1) + d(R2) d(R1 · R2) = d(R1) ? d(R2) Clearly, if both R1 and R2 are nullable then (R1 · R2) is nullable, and if either R1 or R2 is nullable then (R1 + R2)…

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• Evaluating expressions using Visual Studio 2005 SDK rather than automation's Debugger::GetExpression

  - by brone

  I'm looking into writing an addin (or package, if necessary) for Visual Studio 2005 that needs watch window type functionality -- evaluation of expressions and examination of the types. The automation facilities provide Debugger::GetExpression, which is useful enough, but the information provided is a bit crude. From looking through the docs, it…

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• How to parse mathematical expressions involving parentheses

  - by Rob P.

  Please forgive my title, I really don't know how to phrase it better. This isn't a school assignment or anything, but I realize it's a mostly academic question. But, what I've been struggling to do is parse 'math' text and come up with an answer. For Example - I can figure out how to parse '5 + 5' or '3 * 5' - but I fail when I try to…

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• Mocking objects with complex Lambda Expressions as parameters

  - by iCe

  Hi there, I´m encountering this problem trying to mock some objects that receive complex lambda expressions in my projects. Mostly with with proxy objects that receive this type of delegate: Func<Tobj, Fun<TParam1, TParam2, TResult>> I have tried to use Moq as well as RhinoMocks to acomplish mocking those types of objects,…

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• List<object>.RemoveAll - How to create an appropriate Predicate

  - by CJM

  This is a bit of noob question - I'm still fairly new to C# and generics and completely new to predicates, delegates and lamda expressions... I have a class 'Enquiries' which contains a generic list of another class called 'Vehicles'. I'm building up the code to add/edit/delete Vehicles from the parent Enquiry. And at the moment, I'm…

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• How to properly translate the "var" result of a lambda expression to a concrete type?

  - by CrimsonX

  So I'm trying to learn more about lambda expressions. I read this question on stackoverflow, concurred with the chosen answer, and have attempted to implement the algorithm using a console app in C# using a simple LINQ expression. My question is: how do I translate the "var result" of the lambda expression into a usable object that…

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• After Effect - Triangle Wave (JavaScript)

  - by PJ Palomaki

  Hi, I'm trying to control a parameter with AE expressions and I need a triangle wave. I've got this so far: freq = 20; amplitude = 8; m = amplitude; i = time*freq; m - (i % (2*m) - m); Unfortunately this gives a saw wave (see below) and my math's a bit rusty, any takers? Thanks! PJ …

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• Left to right expression evaluation

  - by David

  In C# is it guaranteed that expressions are evaluated left to right? For example: myClass = GetClass(); if (myClass == null || myClass.Property > 0) continue; Are there any languages that do not comply?

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• Convert this Linq query from query syntax to lambda expression

  - by Jinkinz

  I'm not sure I like linq query syntax...its just not my preference. But I don't know what this query would look like using lambda expressions, can someone help? from securityRoles in user.SecurityRoles from permissions in securityRoles.Permissions where permissions.SecurableEntity.Name ==…

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• lambdas and attributes in c#

  - by Berryl

  Can you use a lambda expressions as an argument to an attribute? The motivation I am thinking of would be to eliminate reliance on magic strings Cheers, Berryl

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• Restrictons of Python compared to Ruby: lambda's

  - by Shyam

  Hi, I was going over some pages from WikiVS, that I quote from: because lambdas in Python are restricted to expressions and cannot contain statements I would like to know what would be a good example (or more) where this restriction would be, preferably compared to the Ruby language. …

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• Watchguard Firewall WebBlocker Regular Expression for Multiple Domains?

  - by Eric

  I'm pretty sure this is really a regex question, so you can skip to REGEX QUESTION if you want to skip the background. Our primary firewall is a Watchguard X750e running Fireware XTM v11.2. We're using webblocker to block most of the categories, and I'm allowing needed sites as they…

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• Apache MatchRedirect exception regex

  - by Arash Mousavi

  I want to redirect any URL that is Https and hasn't start with "system_" to the same URL with http. for exapmle for this url : https://exsite.tld/some/thing/that/not/start/with/pattern to : http://exsite.tld/some/thing/that/not/start/with/pattern but this url: …

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• Apache mod_proxy_html Substitute: how to re-use part of regex match? (regex variables?)

  - by goober

  Hi all, Have a unique URL-rewriting situation in Apache. I need to be able to take a URL that starts with "\u002f[X]" or '\u002f[X]" Where X is the rest of some URL, and substitute the text "\u002fmeis2\u002f[X] I'm not sure how the Regex works in Apache…

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• non greedy grep command on ubuntu?

  - by ChrisRamakers

  Hi all, I'm building a script which filters out all our translatables from our template system. the problem i'm facing is the occasion where 2 translatables are on one line. These are 2 example lines from a template file which both hold one or more translatables …

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• I am trying to write an htaccess file performs authentication and redirects authenticated users to a

  - by racl101

  This is what I have so far but I can't get the RewriteCond and RewriteRule properly. RewriteEngine On RewriteCond %{LA-U:REMOTE_USER} (\d{3})$ RewriteRule !^%1 http://subdomain.mydomain.com/%1 [R,L]. AuthName "My Domain Protected Area" AuthType Basic…

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• inotifywait usage and exclude

  - by user58542

  I want to monitor special path to any event of create or modified files recursively in it via inotifywait but i cant know what's problem. i have some folder that i want to exclude thame. watchpath -> folder1 -> file1 ->…

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• apache virtualhost: Auto subdomain with exception

  - by Ineentho

  I've been searching for a way to automatically redirect domains to a specific folder, and fond a good answer here on serverfault: Apache2 VirtualHost auto subdomain. (The accepted answer) So far everything works good, however now I need to add an…

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• Zabbix doesn't update value from file neither with log[] nor with vfs.file.regexp[] item

  - by tymik

  I am using Zabbix 2.2. I have a very specific environment, where I have to generate desired data to file via script, then upload that file to ftp from host and download it to Zabbix server from ftp. After file is downloaded, I check it with log[]…

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• Common Table Expressions slow when using a table variable

  - by Phil Haselden

  I have been experimenting with the following (simplified) CTE. When using a table variable () the query runs for minutes before I cancel it. Any of the other commented out methods return in less than a second. If I replace the whole WHERE…

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• Extracting pair member in lambda expressions and template typedef idiom

  - by Nazgob

  Hi, I have some complex types here so I decided to use nifty trick to have typedef on templated types. Then I have a class some_container that has a container as a member. Container is a vector of pairs composed of element and vector. I…

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• Evaluation of Haskell Statements/Expressions using GHC API

  - by Cetin Sert

  For a tool I'm writing ( http://hackage.haskell.org/package/explore ) I need a way to read haskell function definitions at run-time, apply them to values from my tool and retrieve the results of their application. Can anyone give me a…

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• Properly handling possible System.NullReferenceException in lambda expressions

  - by Travis Johnson

  Here's the query in question return _projectDetail.ExpenditureDetails .Where(detail => detail.ProgramFund == _programFund && detail.Expenditure.User == _creditCardHolder) .Sum(detail =>…

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• Regular Expressions Tutorials

  - by Lucas McCoy

  Does anyone know of a regular expression tutorial that doesn't use a designer?

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• Extract parameter value from url using regular expressions

  - by Oscar Reyes

  This should be very simple ( when you know the answer ). From this question I want to give it a try to the posted solution. And my question is: How to get the parameter value of a given url using javascript regexp? …

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