In this article I’ll show you a simple PHP function that implements email validation.
The function performs two checks :
It checks both if the email has correct syntax and if the domain of the email exists.
Whenever you want to post your email address to the public and don’t want to use a Contact Form which usually hides the address, try to display the address of the email as an image in order to avoid spam.
One way to achieve this is to manually create your email address as an image and embed it to your contact page. Most of the times we want this operation to be automatically. So, I have created a simple example to show you how you can make this possible.
Whenever we create a new source code file for a free software with Emacs we need first to add the short brief of the blessed GNU GPL v3. You can add a LISP function to your “~/.emacs” configuration file and call it whenever you want to add it.
If the file is missing you can create it.
After inserting the function and restarting Emacs you can call the function:
M-x insert-short-gpl (press Alt-x, type insert-short-gpl, press return).
Many text editors create backup files with names ending with “~”.
Most of the times these files are annoying and unnecessary…
So, you can use the following piped commands to remove them :
find / | grep "^.*~$"
| sed -e 's/\(^.*$\)/"\1"/g'
| xargs rm -f > /dev/null 2>&1
Please take account that this version handles correctly also filepaths containing space characters.
Efstathios Chatzikyriakidis 
Ignoring multiline comments in compilers with Flex.
In your lexer when lexical analysis is performed you may want to ignore any multiline C-like comments.
Continue reading →