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# 1  
Old 06-23-2019
Using man command

hi linux expert

how to use man command for get help about "extended regular expression"?

many thanks
# 2  
Old 06-23-2019
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
These 2 Users Gave Thanks to jim mcnamara For This Post:
# 3  
Old 06-24-2019
man 7 regex fully explains "modern" (extended) regular expressions and how they differ from "basic" REs.

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