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regexp \- Plan 9 regular expression notation
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This manual page describes the regular expression
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syntax used by the Plan 9 regular expression library
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.I "regular expression"
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a set of strings of characters.
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A member of this set of strings is said to be
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by the regular expression. In many applications
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a delimiter character, commonly
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bounds a regular expression.
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In the following specification for regular expressions
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the word `character' means any character (rune) but newline.
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The syntax for a regular expression
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e3: literal | charclass | '.' | '^' | '$' | '(' e0 ')'
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is any non-metacharacter, or a metacharacter
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it matches any character in (or not in)
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A negated character class never
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order, stands for the inclusive
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and the regular expression delimiter
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have no special meaning and
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matches any character.
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matches the beginning of a line;
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matches the end of the line.
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operators match zero or more
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instances respectively of the preceding regular expression
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A concatenated regular expression,
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followed by a match to
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An alternative regular expression,
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matches either a match to
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A match to any part of a regular expression
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extends as far as possible without preventing
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a match to the remainder of the regular expression.
added
removed
lib9/regexp.7
