Collating Symbols and Equivalence Classes

[kfs1]

from the awk man page:

       Collating Symbols
              A collating symbol is a multi-character collating element  
enclosed in [.  and .].  For example, if ch is a  col-
              lating element, then [[.ch.]]  is a regular expression that  
matches this collating element, while [ch] is a reg-
              ular expression that matches either c or h.

       Equivalence Classes
              An equivalence class is a locale-specific name for a list  
of  characters  that  are  equivalent.   The  name  is
              enclosed  in  [=  and =].  For example, the name e might be  
used to represent all of "e," "<B4>," and "`."  In this
              case, [[=e=]] is a regular expression that matches any of e,  
<B4>^H<B4>, or `.

but this isn't explained in the grep man page nor the info grep page on  
the website: http://www.gnu.org/software/grep/doc/

I don't know if this is covered, just not on the webpage, because i don't  
have info installed(i am on archlinux which only allows
man pages)



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