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Diffstat (limited to 'src/pkg/regexp/syntax/doc.go')
| -rw-r--r-- | src/pkg/regexp/syntax/doc.go | 131 |
1 files changed, 0 insertions, 131 deletions
diff --git a/src/pkg/regexp/syntax/doc.go b/src/pkg/regexp/syntax/doc.go deleted file mode 100644 index 8e72c90d3..000000000 --- a/src/pkg/regexp/syntax/doc.go +++ /dev/null @@ -1,131 +0,0 @@ -// 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} etc. (but not the other -forms x* etc.) have an upper limit of n=1000. Negative or higher explicit -counts yield the parse error ErrInvalidRepeatSize. - -Grouping: - (re) numbered capturing group (submatch) - (?P<name>re) named & numbered capturing group (submatch) - (?:re) non-capturing group (submatch) - (?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 \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 an 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: - \d digits (== [0-9]) - \D not digits (== [^0-9]) - \s whitespace (== [\t\n\f\r ]) - \S not whitespace (== [^\t\n\f\r ]) - \w ASCII word characters (== [0-9A-Za-z_]) - \W not ASCII 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 |