diff options
Diffstat (limited to 'src/regexp/syntax/doc.go')
| -rw-r--r-- | src/regexp/syntax/doc.go | 48 |
1 files changed, 24 insertions, 24 deletions
diff --git a/src/regexp/syntax/doc.go b/src/regexp/syntax/doc.go index 8e72c90d3..e5e71f14f 100644 --- a/src/regexp/syntax/doc.go +++ b/src/regexp/syntax/doc.go @@ -21,8 +21,8 @@ Single characters: [^xyz] negated character class \d Perl character class \D negated Perl character class - [:alpha:] ASCII character class - [:^alpha:] negated ASCII 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) @@ -46,14 +46,14 @@ Repetitions: 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. +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 (submatch) + (?:re) non-capturing group (?flags) set flags within current group; non-capturing (?flags:re) set flags during re; non-capturing @@ -69,7 +69,7 @@ Empty strings: $ 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 + \B not at ASCII word boundary \z at end of text Escape sequences: @@ -103,29 +103,29 @@ Named character classes as character class elements: [\p{Name}] named Unicode property inside character class (== \p{Name}) [^\p{Name}] named Unicode property inside negated character class (== \P{Name}) -Perl character classes: +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 ASCII word characters (== [0-9A-Za-z_]) - \W not ASCII word characters (== [^0-9A-Za-z_]) + \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]) + [[: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 |