[Javascript] Selecting certain areas of text in a string

[Rees, Mark]

If you need to match anything more complex than a single movie name e.g. if you need to match somemovie1.flv, somemovie2.flv and so on, you could consider a regular expression. 

Here's a few links to get started

A general introduction
http://www.regular-expressions.info/tutorial.html

JavaScript's implementation
https://developer.mozilla.org/en/Core_JavaScript_1.5_Reference/Global_Objects/RegExp

Firefox has a good add-on called "regular expressions tester" which you can use to fine tune your expression. 

You can use it as the first parameter in the string.replace command. You will find an explanation and some examples here
https://developer.mozilla.org/En/Core_JavaScript_1.5_Reference/Global_Objects/String/Replace


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-----Original Message-----
From: javascript-bounces at lists.evolt.org
[mailto:javascript-bounces at lists.evolt.org]On Behalf Of Nick Fitzsimons
Sent: 10 March 2009 17:30
To: JavaScript List
Subject: Re: [Javascript] Selecting certain areas of text in a string


Apologies if this gets posted twice - my webmail is playing up :-(

Assuming your <object> element has the ID "movie" then

var movie = document.getElementById("movie");
movie.src = movie.src.replace(/somevideo.flv/, "othervideo.flv");

should do the trick.

Regards,

Nick.

On Tue, March 10, 2009 3:35 pm, javascript at webdesignofficina.com wrote:
>
> Hi there,
>
> Currently trying to change the url of an embedded element in a page...
> My problem is that many other parameters are passed along the url of
> the object, in the src property:
>
> src="../pluginsv/mediaplayer.swf?file=http://www.somesite.com/video/
> somevideo.flv&autostart=true&displayheight=202&allowfullscreen=over&controlbar=over&usefullscreen=true&backcolor=0x121212&frontcolor=0xffffff&lightcolor=0x000000&bufferlength=10"
>
> I'd like to only rewrite this part: file=http://www.somesite.com/
> video/somevideo.flv
> Rest of the parameters should remain untouched...
>
> I know I should use String.replace, something like:
>
> var str="somevideo.flv!";
> document.write(str.replace(/somevideo.flv/,"othervideo.flv"));
>
> But I have absolutely no idea on how target this piece of text only in the
> whole src="...", starting from ending file path, from / to .flv
>
> Any help would be greatly appreciated.
>
> Thank you.
>
> Best regards,
>
> Guillaume Stricher