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Chapter 7. Advanced Procmail > Regular expressions

Regular expressions

Procmail implements a form of regular expressions that operates slightly differently than other UNIX utilities. Here we cover the basic differences and guide the new user into the powerful world of regular expressions, their meanings, implementations, and uses.

We have already seen that Procmail matches are case insensitive unless the D flag is used. This is also true for regular expressions. Procmail also uses multiline matches by default.


  

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