From: Daniel Danopia <danopia@...>
Date: 2009-10-08T20:00:10+09:00
Subject: Re: Detect any "<a href=mailto:...>...</a>" string in a string?

On Oct 7, 5:19 pm, Greg Donald <gdon...@gmail.com> wrote:
> On Wed, Oct 7, 2009 at 3:57 PM, Joshua Muheim <fo...@josh.ch> wrote:
> > I have a long, long string of HTML tags. There might be some unprotected
> > Email links in there like this:
>
> > <a href="mailto:s...@email.xx">Some Email</a>
>
> > or
>
> > <a href="mailto:s...@email.xx?subject=Something">Some Email</a>
>
> > or...
>
> > I need to detect these email links and substitute them with something
> > different, like a JavaScript function to obfuscate them:
>
> > obfuscate("some","email.xx","Something","Some Email")
>
> > or something like that. Sadly I have no idea how to find the needed
> > string parts. I stumbled upon the TMail GEM and guess it could help me a
> > lot... But I don't get any further now.
>
> Here's how I do it in PHP, if you wanna rework it into Ruby:
>
> $GLOBALS[ 'EMAIL_LINK_REGEX' ] = "#<a[^>]*mailto:([^'\" ]*)['\"
> ]>([^<]*)</a>#i";
>
> $html = preg_replace_callback( $GLOBALS[ 'EMAIL_LINK_REGEX' ],
> 'fubarEmail', $html );
>
> function fubarEmail( $matches )
> {
>   $strNewAddress = replaceEntities( $matches[ 1 ] );
>
>   $strText = replaceEntities( $matches[ 2 ] );
>
>   $arrEmail = explode( '&#64;', $strNewAddress );
>
>   $strTag = "<script language='Javascript' type='text/javascript'>\r";
>   $strTag .= "<!--\r";
>   $strTag .= "document.write('<a href=\"mai');\r";
>   $strTag .= "document.write('lto');\r";
>   $strTag .= "document.write(':$arrEmail[0]');\r";
>   $strTag .= "document.write('@');\r";
>   $strTag .= "document.write('$arrEmail[1]\">');\r";
>   $strTag .= "document.write('$strText<\/a>');\r";
>   $strTag .= "// -->\r";
>   $strTag .= "</script><noscript>$arrEmail[0] at \r";
>   $strTag .= str_replace( '&#46;', ' dot ', $arrEmail[ 1 ] ) . '</noscript>';
>
>   return $strTag;
>
> }
>
> --
> Greg Donaldhttp://destiney.com/

You could also use a library such as hpricot or nokogiri to search and
replace all  the <a> tags.

And you should have \r\n, not \r, if you are writing HTML.