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Using man command


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# 2  
man grep has a section on the e option, ERE or POSIX extended regular expressions. There is also perl regex which some linux systems can invoke. This leads to confusion for new folks.

To get a real background you need to to do a quick read outside of the man application. This one explains with examples the differences for ERE vs. plain (regular):

POSIX Basic and Extended Regular Expressions
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# 3  
man 7 regex fully explains "modern" (extended) regular expressions and how they differ from "basic" REs.
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