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What's the state of the art in email validation for Rails?
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/\A[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]+\z/
That was adapted from http://www.regular-expressions.info/email.html -- which you should read if you really want to know all the tradeoffs. If you want a more correct and much more complicated fully RFC822-compliant regex, that's on that page too...
Is it safe to push_back an element from the same vector?
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It looks like http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-closed.html#526 addressed this problem (or something very similar to it) as a potential defect in the standard:
1) Parameters taken by const reference can be changed during ...
How to make a variadic macro (variable number of arguments)
...lained for g++ here, though it is part of C99 so should work for everyone
http://www.delorie.com/gnu/docs/gcc/gcc_44.html
quick example:
#define debug(format, args...) fprintf (stderr, format, args)
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SVN encrypted password store
...ide that warning or use an encrypted storage to cache the passwords.
See: http://blogs.collab.net/subversion/2009/07/subversion-16-security-improvements/
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How do you switch pages in Xamarin.Forms?
...on
<?xml version="1.0" encoding="utf-8"?>
<ContentPage
xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:viewmodels="clr-namespace:MyApp.ViewModel"
x:Class="MyApp.Views.MyPage">
<ContentPage.BindingContext>...
JavaScript private methods
...se an error:
r.private_stuff();
More information on this technique here: http://webreflection.blogspot.com/2008/04/natural-javascript-private-methods.html
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How to deal with page breaks when printing a large HTML table
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<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Test</title>
<style type="text/css">
table { page-break-inside:auto }
tr { page-break-inside:avoid; page-break-after:auto }
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Does a break statement break from a switch/select?
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Yes, break breaks the inner switch.
https://play.golang.org/p/SZdDuVjic4
package main
import "fmt"
func main() {
myloop:for x := 0; x < 7; x++ {
fmt.Printf("%d", x)
switch {
case x == 1:
fmt.Println("start")
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{version} wildcard in MVC4 Bundle
... markup changes.
See the following link for more information on bundling: http://weblogs.asp.net/jgalloway/archive/2012/08/16/asp-net-4-5-asp-net-mvc-4-asp-net-web-pages-2-and-visual-studio-2012-web-developer-features.aspx
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How to disable text selection highlighting
...ser-select: none;
/*
Introduced in Internet Explorer 10.
See http://ie.microsoft.com/testdrive/HTML5/msUserSelect/
*/
-ms-user-select: none;
user-select: none;
}
For Internet Explorer < 10 and Opera < 15, you will need to use the unselectable attribute of the element y...