regexp man page on Plan9

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REGEXP(6)							     REGEXP(6)

       regexp - regular expression notation

       A  regular expression specifies a set of strings of characters.	A mem‐
       ber of this set of strings is said to be matched by the regular expres‐
       sion.   In  many	 applications a delimiter character, commonly bounds a
       regular expression.  In the following specification for regular expres‐
       sions 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.

       awk(1), ed(1), grep(1), sam(1), sed(1), regexp(2)

                             _         _         _ 
                            | |       | |       | |     
                            | |       | |       | |     
                         __ | | __ __ | | __ __ | | __  
                         \ \| |/ / \ \| |/ / \ \| |/ /  
                          \ \ / /   \ \ / /   \ \ / /   
                           \   /     \   /     \   /    
                            \_/       \_/       \_/ 
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