Re: [pcre-dev] Help in rewriting broken lookbehind assertion

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Author: Thorsten Schöning
Date:  
To: pcre-dev
Subject: Re: [pcre-dev] Help in rewriting broken lookbehind assertion
Guten Tag Thorsten Schöning,
am Mittwoch, 3. Oktober 2012 um 18:38 schrieben Sie:

> (?i)(?<!(?:(?:p7m|pk7|pkcs7)\.(?:p7m|pk7|pkcs7))|zip|zip\.(?:p7m|pk7|pkcs7))$


In case anyone has similar problems: This regexp can be rewritten to a
valid negative lookbehind assertion if pkcs7 is removed from the
inner branches and just used as a literal in it's only two
combinations it's use in the branches shoudl check.

(a|b|cd)\.(a|b|cd) = (a|b)\.cd|cd\.(a|b)

(?i).+?(?<!(?:p7m|pk7|zip)\.(?:p7m|pk7)|(?:p7m|pk7|zip)\.pkcs7|pkcs7\.(?:p7m|pk7)|zip)$
(?i).+?(?<!(?:p7m|pk7|zip)\.(?:p7m|pk7))(?<!(?:p7m|pk7|zip)\.pkcs7)(?<!pkcs7\.(?:p7m|pk7))(?<!zip)$

Mit freundlichen Grüßen,

Thorsten Schöning

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