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Re: SMTP content-type overflow rule question
From: Rich Graves <rcgraves () gmail com>
Date: Fri, 3 Dec 2010 20:13:13 -0600 (CST)

Am I correct in thinking that:

{300,}$ means "at least 300 occurrences of the preceding character
class, then end-of-line
{300} mean "exactly 300 occurrences of the preceding character class"

No, "{300,}$" means "300 or more matches, and must match up to the very end."

"{300}" means "match 300," which really means "at least 300." We never look at the 301st character.

The earlier version is more expensive on lines exceeding 300 characters, and could potentially false-negative if \r or 
\n appear after the 300th.

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