Your best bet, as toolic and apl suggest, is to use an XML parser. Manually parsing XML is fraught with potential bugs and edge cases. However, assuming your XML is well-formed, you can accomplish this task using Look Around Assertions. Specifically, if you assume that your text field contains no < characters, you can do it with
s/EM(?=[^<]*</article>)/replacement/g.
This will match and replace any occurence of the letters EM that are followed by any number of non-< characters and then a closing article tag.
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Are you posting in the right place? Check out Where do I post X? to know for sure.
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Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
<td> <th> <tr> <tt>
<u> <ul>
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Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
intervention).
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Want more info? How to link
or How to display code and escape characters
are good places to start.
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