String Manipulation Alternatives to RegEx

From: Tom (Tom_at_discussions.microsoft.com)
Date: 09/28/04 

Date: Tue, 28 Sep 2004 04:53:02 -0700

I have string that is 2.5 million bytes long.

I tried using Regular Expressions to look for patterns and replace the
pattern found with a pre-defined text. This works great on some computers
but on some others (win 2K server 1gig of ram) it times out!

So I am looking for an alternative method as I've been told Regular
Expressions are expensive.

Here is my pattern;
white spaces followed by a new line (\n) followed by more spaces plus
a predefined string.

For each occurance, I want to replace this pattern with a predefined string,
thereby removing all the blank lines, cr lf.

Does anyone know of an alternative method to try?
Can you provide an example?

Thanks

Tom

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