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Add two example regexps: (1) one for matching all the characters

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that belong in a character class, and (2) one for matching all
the characters *not* in a character class.

Submitted by:	Mark B, mkbucc at gmail.com
MFC after:	3 days
This commit is contained in:
Giorgos Keramidas 2008-09-05 17:41:20 +00:00
parent 35fa2f1bcd
commit 0efdfdee5f
1 changed files with 8 additions and 0 deletions
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8
lib/libc/regex/re_format.7
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@ -288,6 +288,14 @@ These stand for the character classes defined in
A locale may provide others. A locale may provide others.
A character class may not be used as an endpoint of a range. A character class may not be used as an endpoint of a range.
.Pp .Pp
A bracketed expression like
.Ql [[:class:]]
can be used to match a single character that belongs to a character
class.
The reverse, matching any character that does not belong to a specific
class, the negation operator of bracket expressions may be used:
.Ql [^[:class:]] .
.Pp
There are two special cases\(dd of bracket expressions: There are two special cases\(dd of bracket expressions:
the bracket expressions the bracket expressions
.Ql [[:<:]] .Ql [[:<:]]