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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