On Wed, 20 Jul 2005, Ian Eiloart wrote:

> 
> > if $message_headers does not contain "xxxx:" then ...
> 
> Ooh, isn't this going to generate a number of false positives? Should we not
> match on the start of the line? Can we say this?:
> 
>    if $message_headers matches "^xxxx: "

If xxxx is pretty unique, the false positive risk is low. You would have 
to say "(?m)^xxxx:" to enable "multiline mode" if you want to be 
pedantic. Or use "\\N(^|\\n)xxxx:".

-- 
Philip Hazel            University of Cambridge Computing Service,
[EMAIL PROTECTED]      Cambridge, England. Phone: +44 1223 334714.
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