From 78e51a8c6678b6e3dff3d619aa786669f531f4bc Mon Sep 17 00:00:00 2001 From: rsc Date: Fri, 14 Jan 2005 03:45:44 +0000 Subject: checkpoint --- man/man7/regexp.html | 131 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 131 insertions(+) create mode 100644 man/man7/regexp.html (limited to 'man/man7/regexp.html') diff --git a/man/man7/regexp.html b/man/man7/regexp.html new file mode 100644 index 00000000..1bc2c74e --- /dev/null +++ b/man/man7/regexp.html @@ -0,0 +1,131 @@ + +regexp(7) - Plan 9 from User Space + + + + +
+
+
REGEXP(7)REGEXP(7) +
+
+

NAME
+ +
+ + regexp – Plan 9 regular expression notation
+ +
+

DESCRIPTION
+ +
+ + This manual page describes the regular expression syntax used + by the Plan 9 regular expression library regexp(3). It is the + form used by egrep(1) before egrep got complicated. +
+ + A regular expression specifies a set of strings of characters. + A member of this set of strings is said to be matched by the regular + expression. In many applications a delimiter character, commonly + /, bounds a regular expression. In the following specification + for regular expressions the word ‘character’ means any + character (rune) but newline. +
+ + The syntax for a regular expression e0 is
+ +
+ + e3:    literal | charclass | '.' | '^' | '$' | '(' e0 ')'
+ e2:    e3
+ +
+ + |    e2 REP
+ +
+ REP: '*' | '+' | '?'
+ e1:    e2
+ +
+ + |    e1 e2
+ +
+ e0:    e1
+ +
+ + |    e0 '|' e1
+ +
+ +
+ +
+ + + +
+ +
+ A literal is any non-metacharacter, or a metacharacter (one of + .*+?[]()|\^$), or the delimiter preceded by \. +
+ + A charclass is a nonempty string s bracketed [s] (or [^s]); it + matches any character in (or not in) s. A negated character class + never matches newline. A substring a−b, with a and b in ascending + order, stands for the inclusive range of characters between a + and b. In s, the metacharacters −, ], an initial ^, and the + regular expression delimiter must be preceded by a \; other metacharacters + have no special meaning and may appear unescaped. +
+ + A . matches any character. +
+ + A ^ matches the beginning of a line; $ matches the end of the + line. +
+ + The REP operators match zero or more (*), one or more (+), zero + or one (?), instances respectively of the preceding regular expression + e2. +
+ + A concatenated regular expression, e1e2, matches a match to e1 + followed by a match to e2. +
+ + An alternative regular expression, e0|e1, matches either a match + to e0 or a match to e1. +
+ + 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.
+ +
+

SEE ALSO
+ +
+ + regexp(3)
+ +
+ +

 +
+
+ + +
+
+
+Space Glenda +
+
+ + -- cgit v1.2.3