Problem using Regex to manipulate string

[kieran]

Hi,

I need to change a bunch of links...i need to append a username on the
end of each one. The link always starts the same i.e. - <a
href=http://www.link.ie/kjlasdfl - but the rest of the link ends with
different numbers each time.

The text i want to append on is - &user=usertom.

I know i use regex to do this. At the moment i have the text in a
string but can not get this manipulation working for me.

Any ideas and guidance much appreciated.

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This is a whole example (the values in 'id=r-0_0' change also) -
<a
href="http://www.link.ie/stories.php3?ca=38&si=1457798&issue_id=12923"
id=r-0_0>