pattern matching

[ofuuzo1@yahoo.no]

Hi,
I am new to php. I have text files each containing some metadata. I
would like to use preg_replace to remove some of the fields in each
text file. Some contents of a field can go over several lines. How can
I do it using preg_replace?

Thanks in advance
Ofuuzo

<?xml version="1.0" encoding="utf-8" standalone="no" ?>
<dublin_core schema="dc">
<dcvalue element="contri butor" qualifier="advi sor">Test, Testman
several lines several lines several lines several lines several
lines several lines several lines several lines several lines
several lines several lines several lines several lines </
dcvalue>
<dcvalue element="date" qualifier="issu ed">2007-11-15</dcvalue>
<dcvalue element="format " qualifier="exte nt">4869077 bytes</
dcvalue>
<dcvalue element="format " qualifier="mime type">applicati on/pdf</
dcvalue>
<dcvalue element="langua ge" qualifier="iso" >nob</dcvalue>
<dcvalue element="subjec t" qualifier="cour seID">NOR-3920</dcvalue>
<dcvalue element="subjec t" qualifier="depa rtmentID">6640</dcvalue>
</dublin_core>