mirror of
https://github.com/autc04/Retro68.git
synced 2024-09-08 20:55:01 +00:00
132 lines
5.3 KiB
Go
132 lines
5.3 KiB
Go
// Copyright 2012 The Go Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
// DO NOT EDIT. This file is generated by mksyntaxgo from the RE2 distribution.
|
|
|
|
/*
|
|
Package syntax parses regular expressions into parse trees and compiles
|
|
parse trees into programs. Most clients of regular expressions will use the
|
|
facilities of package regexp (such as Compile and Match) instead of this package.
|
|
|
|
Syntax
|
|
|
|
The regular expression syntax understood by this package when parsing with the Perl flag is as follows.
|
|
Parts of the syntax can be disabled by passing alternate flags to Parse.
|
|
|
|
|
|
Single characters:
|
|
. any character, possibly including newline (flag s=true)
|
|
[xyz] character class
|
|
[^xyz] negated character class
|
|
\d Perl character class
|
|
\D negated Perl character class
|
|
[[:alpha:]] ASCII character class
|
|
[[:^alpha:]] negated ASCII character class
|
|
\pN Unicode character class (one-letter name)
|
|
\p{Greek} Unicode character class
|
|
\PN negated Unicode character class (one-letter name)
|
|
\P{Greek} negated Unicode character class
|
|
|
|
Composites:
|
|
xy x followed by y
|
|
x|y x or y (prefer x)
|
|
|
|
Repetitions:
|
|
x* zero or more x, prefer more
|
|
x+ one or more x, prefer more
|
|
x? zero or one x, prefer one
|
|
x{n,m} n or n+1 or ... or m x, prefer more
|
|
x{n,} n or more x, prefer more
|
|
x{n} exactly n x
|
|
x*? zero or more x, prefer fewer
|
|
x+? one or more x, prefer fewer
|
|
x?? zero or one x, prefer zero
|
|
x{n,m}? n or n+1 or ... or m x, prefer fewer
|
|
x{n,}? n or more x, prefer fewer
|
|
x{n}? exactly n x
|
|
|
|
Implementation restriction: The counting forms x{n,m}, x{n,}, and x{n}
|
|
reject forms that create a minimum or maximum repetition count above 1000.
|
|
Unlimited repetitions are not subject to this restriction.
|
|
|
|
Grouping:
|
|
(re) numbered capturing group (submatch)
|
|
(?P<name>re) named & numbered capturing group (submatch)
|
|
(?:re) non-capturing group
|
|
(?flags) set flags within current group; non-capturing
|
|
(?flags:re) set flags during re; non-capturing
|
|
|
|
Flag syntax is xyz (set) or -xyz (clear) or xy-z (set xy, clear z). The flags are:
|
|
|
|
i case-insensitive (default false)
|
|
m multi-line mode: ^ and $ match begin/end line in addition to begin/end text (default false)
|
|
s let . match \n (default false)
|
|
U ungreedy: swap meaning of x* and x*?, x+ and x+?, etc (default false)
|
|
|
|
Empty strings:
|
|
^ at beginning of text or line (flag m=true)
|
|
$ at end of text (like \z not Perl's \Z) or line (flag m=true)
|
|
\A at beginning of text
|
|
\b at ASCII word boundary (\w on one side and \W, \A, or \z on the other)
|
|
\B not at ASCII word boundary
|
|
\z at end of text
|
|
|
|
Escape sequences:
|
|
\a bell (== \007)
|
|
\f form feed (== \014)
|
|
\t horizontal tab (== \011)
|
|
\n newline (== \012)
|
|
\r carriage return (== \015)
|
|
\v vertical tab character (== \013)
|
|
\* literal *, for any punctuation character *
|
|
\123 octal character code (up to three digits)
|
|
\x7F hex character code (exactly two digits)
|
|
\x{10FFFF} hex character code
|
|
\Q...\E literal text ... even if ... has punctuation
|
|
|
|
Character class elements:
|
|
x single character
|
|
A-Z character range (inclusive)
|
|
\d Perl character class
|
|
[:foo:] ASCII character class foo
|
|
\p{Foo} Unicode character class Foo
|
|
\pF Unicode character class F (one-letter name)
|
|
|
|
Named character classes as character class elements:
|
|
[\d] digits (== \d)
|
|
[^\d] not digits (== \D)
|
|
[\D] not digits (== \D)
|
|
[^\D] not not digits (== \d)
|
|
[[:name:]] named ASCII class inside character class (== [:name:])
|
|
[^[:name:]] named ASCII class inside negated character class (== [:^name:])
|
|
[\p{Name}] named Unicode property inside character class (== \p{Name})
|
|
[^\p{Name}] named Unicode property inside negated character class (== \P{Name})
|
|
|
|
Perl character classes (all ASCII-only):
|
|
\d digits (== [0-9])
|
|
\D not digits (== [^0-9])
|
|
\s whitespace (== [\t\n\f\r ])
|
|
\S not whitespace (== [^\t\n\f\r ])
|
|
\w word characters (== [0-9A-Za-z_])
|
|
\W not word characters (== [^0-9A-Za-z_])
|
|
|
|
ASCII character classes:
|
|
[[:alnum:]] alphanumeric (== [0-9A-Za-z])
|
|
[[:alpha:]] alphabetic (== [A-Za-z])
|
|
[[:ascii:]] ASCII (== [\x00-\x7F])
|
|
[[:blank:]] blank (== [\t ])
|
|
[[:cntrl:]] control (== [\x00-\x1F\x7F])
|
|
[[:digit:]] digits (== [0-9])
|
|
[[:graph:]] graphical (== [!-~] == [A-Za-z0-9!"#$%&'()*+,\-./:;<=>?@[\\\]^_`{|}~])
|
|
[[:lower:]] lower case (== [a-z])
|
|
[[:print:]] printable (== [ -~] == [ [:graph:]])
|
|
[[:punct:]] punctuation (== [!-/:-@[-`{-~])
|
|
[[:space:]] whitespace (== [\t\n\v\f\r ])
|
|
[[:upper:]] upper case (== [A-Z])
|
|
[[:word:]] word characters (== [0-9A-Za-z_])
|
|
[[:xdigit:]] hex digit (== [0-9A-Fa-f])
|
|
|
|
*/
|
|
package syntax
|