Regular expression optimization

Hi,
I am replaceing a big string using different regular expressions (see
some example at the end of the message). The problem is whenever I
apply a "replace" it makes a new copy of string and I want to avoid
that. My question here is if there is a way to pass either a memory
stream or array of "find", "replace" expressions or any other way to
avoid multiple copies of a string.

Any help will be highly appreciated

Regards,
Billla

Example:
'Delete all namespaces from <multistatus> root element
Pattern = "\<a\:multistatus [^>]*\>"
ReplaceWith = "<a:multistatus>"
sContents = Regex.Replace(sContents, Pattern, ReplaceWith,
RegexOptions.IgnorePatternWhitespace)

'Step#8-B.
'doing the closing tag part
Pattern = "\<\/response\>"
ReplaceWith = "</nsResp:response>"
sContents = Regex.Replace(sContents, Pattern, ReplaceWith,
RegexOptions.IgnorePatternWhitespace)

.

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