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-.TH REGEXP9 7
-.de EX
-.nf
-.ft B
-..
-.de EE
-.fi
-.ft R
-..
-.de LR
-.if t .BR \\$1 \\$2
-.if n .RB ` \\$1 '\\$2
-..
-.de L
-.nh
-.if t .B \\$1
-.if n .RB ` \\$1 '
-..
-.SH NAME
-regexp9 \- Plan 9 regular expression notation
-.SH DESCRIPTION
-This manual page describes the regular expression
-syntax used by the Plan 9 regular expression library
-.IR regexp9 (3).
-It is the form used by
-.IR egrep (1)
-before
-.I egrep
-got complicated.
-.PP
-A 
-.I "regular expression"
-specifies
-a set of strings of characters.
-A member of this set of strings is said to be
-.I matched
-by the regular expression.  In many applications
-a delimiter character, commonly
-.LR / ,
-bounds a regular expression.
-In the following specification for regular expressions
-the word `character' means any character (rune) but newline.
-.PP
-The syntax for a regular expression
-.B e0
-is
-.IP
-.EX
-e3:  literal | charclass | '.' | '^' | '$' | '(' e0 ')'
-
-e2:  e3
-  |  e2 REP
-
-REP: '*' | '+' | '?'
-
-e1:  e2
-  |  e1 e2
-
-e0:  e1
-  |  e0 '|' e1
-.EE
-.PP
-A
-.B literal
-is any non-metacharacter, or a metacharacter
-(one of
-.BR .*+?[]()|\e^$ ),
-or the delimiter
-preceded by 
-.LR \e .
-.PP
-A
-.B charclass
-is a nonempty string
-.I s
-bracketed
-.BI [ \|s\| ]
-(or
-.BI [^ s\| ]\fR);
-it matches any character in (or not in)
-.IR s .
-A negated character class never
-matches newline.
-A substring 
-.IB a - b\f1,
-with
-.I a
-and
-.I b
-in ascending
-order, stands for the inclusive
-range of
-characters between
-.I a
-and
-.IR b .
-In 
-.IR s ,
-the metacharacters
-.LR - ,
-.LR ] ,
-an initial
-.LR ^ ,
-and the regular expression delimiter
-must be preceded by a
-.LR \e ;
-other metacharacters 
-have no special meaning and
-may appear unescaped.
-.PP
-A 
-.L .
-matches any character.
-.PP
-A
-.L ^
-matches the beginning of a line;
-.L $
-matches the end of the line.
-.PP
-The 
-.B REP
-operators match zero or more
-.RB ( * ),
-one or more
-.RB ( + ),
-zero or one
-.RB ( ? ),
-instances respectively of the preceding regular expression 
-.BR e2 .
-.PP
-A concatenated regular expression,
-.BR "e1\|e2" ,
-matches a match to 
-.B e1
-followed by a match to
-.BR e2 .
-.PP
-An alternative regular expression,
-.BR "e0\||\|e1" ,
-matches either a match to
-.B e0
-or a match to
-.BR e1 .
-.PP
-A match to any part of a regular expression
-extends as far as possible without preventing
-a match to the remainder of the regular expression.
-.SH "SEE ALSO"
-.IR regexp9 (3)