how to append some string in img src by regularexpression

[agradip]

i have query regarding regular expression

when i am grabbing url content i need to add the img src path as per the specified url

i want to append a text after img src by matching though regular expression ,
like
suppose <img src="top.gif">
i want make it like <img src="www.bastio ncoup.com/top.gif">

[acoder]

I think the preg_replace function should do the trick. What do you want to match?

<img src="top.gif">

or

<img [I]anything here[/I] src="[I]somefile[/I]" [I]anything here[/I]>

and replace somefile with the url + somefile?