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Use regexps on mail.app header filters Apps
The default header filters in Mail.app will fail to filter out headers like "Delivered-To:". To fix this, in the Preferences --> Viewing panel, on the Show Header Detail pop-up, click Custom then double click on the "To" filter, and change it to "^To:".

These filters are Regular Expressions, or regexps. They are patterns that match text. In regexp, a caret (^) at the beginning of the string means "the string starts with".

^To: - matches only strings that start with "To:".

The original pattern "To" happens to match the word "To" at the end of "Delivered-To". That's why you see that extra header line.

[Editor's note: regexps are incredibly powerful, and for those new to UNIX (like myself!), incredibly obtuse and confusing. I've been doing some reading on the web about them, and I found a tutorial written by Jan Borsodi which I found to be thorough and easy to read. Worth a view if you'd like to know more of what you can do with regexps; "^" is just the tip of the (large!) iceberg!]
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Use regexps on mail.app header filters | 2 comments | Create New Account
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'nother Reg Exp link
Authored by: djTurbonium on Aug 16, '01 08:47:47PM
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/jscript7/html/jsgrpregexpsyntax.asp is a good quick reference of Reg Exp syntax. It applies to VBScript and JScript's interpretation of Reg Expns but can be used for everyday RE interpretation too.
Warning: those who melt if viewing the word 'Microsoft' shouldn't go there.

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man regexp ;o)
Authored by: spyro_le_dragon on Aug 17, '01 05:32:05AM

in case you're lost in your CLI and need a quick reminder



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