From: Li Chen <chen_li3@...>
Date: 2007-07-31T22:25:35+09:00
Subject: How to substitute a string with  different size

Hi all,

I deal with a mixture of text and binary file. I want to search a
pattern in the string and replace it with a new pattern, then write to a
new file. I use the following script(only part of the script)

str.gsub!(/old_pattern/,"new_pattern")
file.seek(-str.length,IO::SEEK_CUR)
file.print str

It works fine if the both old_pattern and new_pattern are the same size.
But it will produce unpreditable result if the sizes are different. I
wonder if any one out there knows how to explain it and provide a Ruby
way solution.

Thanks,

Li
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