How do I do to update part of a string?

From: Date: Tue, 16 Jan 2001 02:39:03 +0000
Subject: How do I do to update part of a string?
Groups: php.general 
Request: Send a blank email to php-general+get-34738@lists.php.net to get a copy of this message
I have a big string. How can I do to find some text inside and modify that text? I was thinking about ereg_replace(). But it is capable to handle big chuncks of text? If yes, it will notbe too heavy for theserver? Any other ideas? Thank you, Rom

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