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Diffstat (limited to 'doc/SYNTAX.md')
| -rw-r--r-- | doc/SYNTAX.md | 137 |
1 files changed, 76 insertions, 61 deletions
diff --git a/doc/SYNTAX.md b/doc/SYNTAX.md index 69ecf3a..c38e5c8 100644 --- a/doc/SYNTAX.md +++ b/doc/SYNTAX.md @@ -1,7 +1,7 @@ # Oniguruma syntax (operator) configuration -_Documented for Oniguruma 6.9.3 (2019/08/08)_ +_Documented for Oniguruma 6.9.5 (2020/01/23)_ ---------- @@ -75,7 +75,7 @@ data set by `onig_set_meta_char()` will be ignored. ### 1. ONIG_SYN_OP_DOT_ANYCHAR (enable `.`) -_Set in: PosixBasic, PosixExtended, Emacs, Grep, GnuRegex, Java, Perl, Perl_NG, Ruby, Oniguruma_ +_Set in: Oniguruma, PosixBasic, PosixExtended, Emacs, Grep, GnuRegex, Java, Perl, Perl_NG, Ruby_ Enables support for the standard `.` metacharacter, meaning "any one character." You usually want this flag on unless you have turned on `ONIG_SYN_OP_VARIABLE_META_CHARACTERS` @@ -84,7 +84,7 @@ so that you can use a metacharacter other than `.` instead. ### 2. ONIG_SYN_OP_ASTERISK_ZERO_INF (enable `r*`) -_Set in: PosixBasic, PosixExtended, Emacs, Grep, GnuRegex, Perl, Java, Perl_NG, Ruby, Oniguruma_ +_Set in: Oniguruma, PosixBasic, PosixExtended, Emacs, Grep, GnuRegex, Perl, Java, Perl_NG, Ruby_ Enables support for the standard `r*` metacharacter, meaning "zero or more r's." You usually want this flag set unless you have turned on `ONIG_SYN_OP_VARIABLE_META_CHARACTERS` @@ -103,7 +103,7 @@ behavior. ### 4. ONIG_SYN_OP_PLUS_ONE_INF (enable `r+`) -_Set in: PosixExtended, Emacs, GnuRegex, Perl, Java, Perl_NG, Ruby, Oniguruma_ +_Set in: Oniguruma, PosixExtended, Emacs, GnuRegex, Perl, Java, Perl_NG, Ruby_ Enables support for the standard `r+` metacharacter, meaning "one or more r's." You usually want this flag set unless you have turned on `ONIG_SYN_OP_VARIABLE_META_CHARACTERS` @@ -122,7 +122,7 @@ behavior. ### 6. ONIG_SYN_OP_QMARK_ZERO_ONE (enable `r?`) -_Set in: PosixExtended, Emacs, GnuRegex, Perl, Java, Perl_NG, Ruby, Oniguruma_ +_Set in: Oniguruma, PosixExtended, Emacs, GnuRegex, Perl, Java, Perl_NG, Ruby_ Enables support for the standard `r?` metacharacter, meaning "zero or one r" or "an optional r." You usually want this flag set unless you have turned on `ONIG_SYN_OP_VARIABLE_META_CHARACTERS` @@ -141,7 +141,7 @@ you want `?` to simply match a literal `?` character, but you still want some wa ### 8. ONIG_SYN_OP_BRACE_INTERVAL (enable `r{l,u}`) -_Set in: PosixExtended, GnuRegex, Perl, Java, Perl_NG, Ruby, Oniguruma_ +_Set in: Oniguruma, PosixExtended, GnuRegex, Perl, Java, Perl_NG, Ruby_ Enables support for the `r{lower,upper}` range form, common to more advanced regex engines, which lets you specify precisely a minimum and maximum range on how many r's @@ -168,7 +168,7 @@ match literal curly brace characters, but you still want some way of activating ### 10. ONIG_SYN_OP_VBAR_ALT (enable `r|s`) -_Set in: PosixExtended, GnuRegex, Perl, Java, Perl_NG, Ruby, Oniguruma_ +_Set in: Oniguruma, PosixExtended, GnuRegex, Perl, Java, Perl_NG, Ruby_ Enables support for the common `r|s` alternation operator. You usually want this flag set. @@ -185,7 +185,7 @@ match a literal `|` character, but you still want some way of activating "altern ### 12. ONIG_SYN_OP_LPAREN_SUBEXP (enable `(r)`) -_Set in: PosixExtended, GnuRegex, Perl, Java, Perl_NG, Ruby, Oniguruma_ +_Set in: Oniguruma, PosixExtended, GnuRegex, Perl, Java, Perl_NG, Ruby_ Enables support for the common `(...)` grouping-and-capturing operators. You usually want this flag set. @@ -203,7 +203,7 @@ activating "grouping" or "capturing" behavior. ### 14. ONIG_SYN_OP_ESC_AZ_BUF_ANCHOR (enable `\A` and `\Z` and `\z`) -_Set in: GnuRegex, Perl, Java, Perl_NG, Ruby, Oniguruma_ +_Set in: Oniguruma, GnuRegex, Perl, Java, Perl_NG, Ruby_ Enables support for the anchors `\A` (start-of-string), `\Z` (end-of-string or newline-at-end-of-string), and `\z` (end-of-string) escapes. @@ -214,7 +214,7 @@ option will recognize that metacharacter instead.) ### 15. ONIG_SYN_OP_ESC_CAPITAL_G_BEGIN_ANCHOR (enable `\G`) -_Set in: GnuRegex, Perl, Java, Perl_NG, Ruby, Oniguruma_ +_Set in: Oniguruma, GnuRegex, Perl, Java, Perl_NG, Ruby_ Enables support for the special anchor `\G` (start-of-previous-match). @@ -231,7 +231,7 @@ exactly the same as `\A`. ### 16. ONIG_SYN_OP_DECIMAL_BACKREF (enable `\num`) -_Set in: PosixBasic, PosixExtended, Emacs, Grep, GnuRegex, Perl, Java, Perl_NG, Ruby, Oniguruma_ +_Set in: Oniguruma, PosixBasic, PosixExtended, Emacs, Grep, GnuRegex, Perl, Java, Perl_NG, Ruby_ Enables support for subsequent matches to back references to prior capture groups `(...)` using the common `\num` syntax (like `\3`). @@ -244,7 +244,7 @@ You usually want this enabled, and it is enabled by default in every built-in sy ### 17. ONIG_SYN_OP_BRACKET_CC (enable `[...]`) -_Set in: PosixBasic, PosixExtended, Emacs, Grep, GnuRegex, Perl, Java, Perl_NG, Ruby, Oniguruma_ +_Set in: Oniguruma, PosixBasic, PosixExtended, Emacs, Grep, GnuRegex, Perl, Java, Perl_NG, Ruby_ Enables support for recognizing character classes, like `[a-z]`. If this flag is not set, `[` and `]` will be treated as ordinary literal characters instead of as metacharacters. @@ -254,7 +254,7 @@ You usually want this enabled, and it is enabled by default in every built-in sy ### 18. ONIG_SYN_OP_ESC_W_WORD (enable `\w` and `\W`) -_Set in: Grep, GnuRegex, Perl, Java, Perl_NG, Ruby, Oniguruma_ +_Set in: Oniguruma, Grep, GnuRegex, Perl, Java, Perl_NG, Ruby_ Enables support for the common `\w` and `\W` shorthand forms. These match "word characters," whose meaning varies depending on the encoding being used. @@ -285,7 +285,7 @@ Most regex syntaxes do _not_ support these metacharacters. ### 20. ONIG_SYN_OP_ESC_B_WORD_BOUND (enable `\b` and `\B`) -_Set in: Grep, GnuRegex, Perl, Java, Perl_NG, Ruby, Oniguruma_ +_Set in: Oniguruma, Grep, GnuRegex, Perl, Java, Perl_NG, Ruby_ Enables support for the common `\b` and `\B` word-boundary metacharacters. The `\b` metacharacter matches a zero-width position at a transition from word-characters to non-word-characters, or vice @@ -297,7 +297,7 @@ are considered "word characters." ### 21. ONIG_SYN_OP_ESC_S_WHITE_SPACE (enable `\s` and `\S`) -_Set in: GnuRegex, Perl, Java, Perl_NG, Ruby, Oniguruma_ +_Set in: Oniguruma, GnuRegex, Perl, Java, Perl_NG, Ruby_ Enables support for the common `\s` and `\S` whitespace-matching metacharacters. @@ -319,7 +319,7 @@ Unicode-equivalent code points, and then matching according to Unicode rules. ### 22. ONIG_SYN_OP_ESC_D_DIGIT (enable `\d` and `\D`) -_Set in: GnuRegex, Perl, Java, Perl_NG, Ruby, Oniguruma_ +_Set in: Oniguruma, GnuRegex, Perl, Java, Perl_NG, Ruby_ Enables support for the common `\d` and `\D` digit-matching metacharacters. @@ -337,7 +337,7 @@ Unicode-equivalent code points, and then matching according to Unicode rules. ### 23. ONIG_SYN_OP_LINE_ANCHOR (enable `^r` and `r$`) -_Set in: Emacs, Grep, GnuRegex, Perl, Java, Perl_NG, Ruby, Oniguruma_ +_Set in: Oniguruma, Emacs, Grep, GnuRegex, Perl, Java, Perl_NG, Ruby_ Enables support for the common `^` and `$` line-anchor metacharacters. @@ -352,7 +352,7 @@ and not any other form.) ### 24. ONIG_SYN_OP_POSIX_BRACKET (enable POSIX `[:xxxx:]`) -_Set in: PosixBasic, PosixExtended, Grep, GnuRegex, Perl, Java, Perl_NG, Ruby, Oniguruma_ +_Set in: Oniguruma, PosixBasic, PosixExtended, Grep, GnuRegex, Perl, Java, Perl_NG, Ruby_ Enables support for the POSIX `[:xxxx:]` character classes, like `[:alpha:]` and `[:digit:]`. The supported POSIX character classes are `alnum`, `alpha`, `blank`, `cntrl`, `digit`, @@ -361,7 +361,7 @@ The supported POSIX character classes are `alnum`, `alpha`, `blank`, `cntrl`, `d ### 25. ONIG_SYN_OP_QMARK_NON_GREEDY (enable `r??`, `r*?`, `r+?`, and `r{n,m}?`) -_Set in: Perl, Java, Perl_NG, Ruby, Oniguruma_ +_Set in: Oniguruma, Perl, Java, Perl_NG, Ruby_ Enables support for lazy (non-greedy) quantifiers: That is, if you append a `?` after another quantifier such as `?`, `*`, `+`, or `{n,m}`, Oniguruma will try to match @@ -370,7 +370,7 @@ as _little_ as possible instead of as _much_ as possible. ### 26. ONIG_SYN_OP_ESC_CONTROL_CHARS (enable `\n`, `\r`, `\t`, etc.) -_Set in: PosixBasic, PosixExtended, Java, Perl, Perl_NG, Ruby, Oniguruma_ +_Set in: Oniguruma, PosixBasic, PosixExtended, Java, Perl, Perl_NG, Ruby_ Enables support for C-style control-code escapes, like `\n` and `\r`. Specifically, this recognizes `\a` (7), `\b` (8), `\t` (9), `\n` (10), `\f` (12), `\r` (13), and @@ -380,7 +380,7 @@ support for recognizing `\v` as code point 11. ### 27. ONIG_SYN_OP_ESC_C_CONTROL (enable `\cx` control codes) -_Set in: Java, Perl, Perl_NG, Ruby, Oniguruma_ +_Set in: Oniguruma, Java, Perl, Perl_NG, Ruby_ Enables support for named control-code escapes, like `\cm` or `\cM` for code-point 13. In this shorthand form, control codes may be specified by `\c` (for "Control") @@ -390,7 +390,7 @@ followed by an alphabetic letter, a-z or A-Z, indicating which code point to rep ### 28. ONIG_SYN_OP_ESC_OCTAL3 (enable `\OOO` octal codes) -_Set in: Java, Perl, Perl_NG, Ruby, Oniguruma_ +_Set in: Oniguruma, Java, Perl, Perl_NG, Ruby_ Enables support for octal-style escapes of up to three digits, like `\1` for code point 1, and `\177` for code point 127. Octal values greater than 255 will result @@ -399,7 +399,7 @@ in an error message. ### 29. ONIG_SYN_OP_ESC_X_HEX2 (enable `\xHH` hex codes) -_Set in: Java, Perl, Perl_NG, Ruby, Oniguruma_ +_Set in: Oniguruma, Java, Perl, Perl_NG, Ruby_ Enables support for hexadecimal-style escapes of up to two digits, like `\x1` for code point 1, and `\x7F` for code point 127. @@ -407,7 +407,7 @@ point 1, and `\x7F` for code point 127. ### 30. ONIG_SYN_OP_ESC_X_BRACE_HEX8 (enable `\x{7HHHHHHH}` hex codes) -_Set in: Perl, Perl_NG, Ruby, Oniguruma_ +_Set in: Oniguruma, Perl, Perl_NG, Ruby_ Enables support for brace-wrapped hexadecimal-style escapes of up to eight digits, like `\x{1}` for code point 1, and `\x{FFFE}` for code point 65534. @@ -415,7 +415,7 @@ like `\x{1}` for code point 1, and `\x{FFFE}` for code point 65534. ### 31. ONIG_SYN_OP_ESC_O_BRACE_OCTAL (enable `\o{1OOOOOOOOOO}` octal codes) -_Set in: Perl, Perl_NG, Ruby, Oniguruma_ +_Set in: Oniguruma, Perl, Perl_NG, Ruby_ Enables support for brace-wrapped octal-style escapes of up to eleven digits, like `\o{1}` for code point 1, and `\o{177776}` for code point 65534. @@ -444,7 +444,7 @@ longer be treated as metacharacters, and instead will be matched as literal ### 1. ONIG_SYN_OP2_QMARK_GROUP_EFFECT (enable `(?...)`) -_Set in: Java, Perl, Perl_NG, Ruby, Oniguruma_ +_Set in: Oniguruma, Java, Perl, Perl_NG, Ruby_ Enables support for the fairly-common `(?...)` grouping operator, which controls precedence but which does _not_ capture its contents. @@ -465,7 +465,7 @@ The supported toggle-able options for this flag are: ### 3. ONIG_SYN_OP2_OPTION_RUBY (enable options `(?imx)` and `(?-imx)`) -_Set in: Ruby, Oniguruma_ +_Set in: Oniguruma, Ruby_ Enables support of regex options. (i,m,x) The supported toggle-able options for this flag are: @@ -477,7 +477,7 @@ The supported toggle-able options for this flag are: ### 4. ONIG_SYN_OP2_PLUS_POSSESSIVE_REPEAT (enable `r?+`, `r*+`, and `r++`) -_Set in: Ruby, Oniguruma_ +_Set in: Oniguruma, Ruby_ Enables support for the _possessive_ quantifiers `?+`, `*+`, and `++`, which work similarly to `?` and `*` and `+`, respectively, but which do not backtrack @@ -499,7 +499,7 @@ extent if subsequent parts of the pattern fail to match. ### 6. ONIG_SYN_OP2_CCLASS_SET_OP (enable `&&` within `[...]`) -_Set in: Java, Ruby, Oniguruma_ +_Set in: Oniguruma, Java, Ruby_ Enables support for character-class _intersection_. For example, with this feature enabled, you can write `[a-z&&[^aeiou]]` to produce a character class @@ -509,7 +509,7 @@ all control codes _except_ newlines. ### 7. ONIG_SYN_OP2_QMARK_LT_NAMED_GROUP (enable named captures `(?<name>...)`) -_Set in: Perl_NG, Ruby, Oniguruma_ +_Set in: Oniguruma, Perl_NG, Ruby_ Enables support for _naming_ capture groups, so that instead of having to refer to captures by position (like `\3` or `$3`), you can refer to them by names @@ -519,7 +519,7 @@ and `(?'name'...)`, but not the Python `(?P<name>...)` syntax. ### 8. ONIG_SYN_OP2_ESC_K_NAMED_BACKREF (enable named backreferences `\k<name>`) -_Set in: Perl_NG, Ruby, Oniguruma_ +_Set in: Oniguruma, Perl_NG, Ruby_ Enables support for substituted backreferences by name, not just by position. This supports using `\k'name'` in addition to supporting `\k<name>`. This also @@ -530,7 +530,7 @@ the match, if the capture matched multiple times, by writing `\k<name+n>` or ### 9. ONIG_SYN_OP2_ESC_G_SUBEXP_CALL (enable backreferences `\g<name>` and `\g<n>`) -_Set in: Perl_NG, Ruby, Oniguruma_ +_Set in: Oniguruma, Perl_NG, Ruby_ Enables support for substituted backreferences by both name and position using the same syntax. This supports using `\g'name'` and `\g'1'` in addition to @@ -554,7 +554,7 @@ enabled by default in any syntax. ### 11. ONIG_SYN_OP2_ESC_CAPITAL_C_BAR_CONTROL (enable `\C-x`) -_Set in: Ruby, Oniguruma_ +_Set in: Oniguruma, Ruby_ Enables support for Ruby legacy control-code escapes, like `\C-m` or `\C-M` for code-point 13. In this shorthand form, control codes may be specified by `\C-` (for "Control") @@ -567,7 +567,7 @@ See also ONIG_SYN_OP_ESC_C_CONTROL, which enables the more-common `\cx` syntax. ### 12. ONIG_SYN_OP2_ESC_CAPITAL_M_BAR_META (enable `\M-x`) -_Set in: Ruby, Oniguruma_ +_Set in: Oniguruma, Ruby_ Enables support for Ruby legacy meta-code escapes. When you write `\M-x`, Oniguruma will match an `x` whose 8th bit is set (i.e., the character code of `x` will be or'ed @@ -577,7 +577,7 @@ with `0x80`). So, for example, you can match `\x81` using `\x81`, or you can wr ### 13. ONIG_SYN_OP2_ESC_V_VTAB (enable `\v` as vertical tab) -_Set in: Java, Ruby, Oniguruma_ +_Set in: Oniguruma, Java, Ruby_ Enables support for a C-style `\v` escape code, meaning "vertical tab." If enabled, `\v` will be equivalent to ASCII code point 11. @@ -585,7 +585,7 @@ Enables support for a C-style `\v` escape code, meaning "vertical tab." If enab ### 14. ONIG_SYN_OP2_ESC_U_HEX4 (enable `\uHHHH` for Unicode) -_Set in: Java, Ruby, Oniguruma_ +_Set in: Oniguruma, Java, Ruby_ Enables support for a Java-style `\uHHHH` escape code for representing Unicode code-points by number, using up to four hexadecimal digits (up to `\uFFFF`). So, @@ -611,7 +611,7 @@ These anchor forms are very obscure, and rarely supported by other regex librari ### 16. ONIG_SYN_OP2_ESC_P_BRACE_CHAR_PROPERTY (enable `\p{...}` and `\P{...}`) -_Set in: Java, Perl, Perl_NG, Ruby, Oniguruma_ +_Set in: Oniguruma, Java, Perl, Perl_NG, Ruby_ Enables support for an alternate syntax for POSIX character classes; instead of writing `[:alpha:]` when this is enabled, you can instead write `\p{alpha}`. @@ -621,7 +621,7 @@ See also ONIG_SYN_OP_POSIX_BRACKET for the classic POSIX form. ### 17. ONIG_SYN_OP2_ESC_P_BRACE_CIRCUMFLEX_NOT (enable `\p{^...}` and `\P{^...}`) -_Set in: Perl, Perl_NG, Ruby, Oniguruma_ +_Set in: Oniguruma, Perl, Perl_NG, Ruby_ Enables support for an alternate syntax for POSIX character classes; instead of writing `[:^alpha:]` when this is enabled, you can instead write `\p{^alpha}`. @@ -636,7 +636,7 @@ _(not presently used)_ ### 19. ONIG_SYN_OP2_ESC_H_XDIGIT (enable `\h` and `\H`) -_Set in: Ruby, Oniguruma_ +_Set in: Oniguruma, Ruby_ Enables support for the Ruby-specific shorthand `\h` and `\H` metacharacters. Somewhat like `\d` matches decimal digits, `\h` matches hexadecimal digits — that is, @@ -658,7 +658,7 @@ You usually do not want this flag to be enabled. ### 21. ONIG_SYN_OP2_QMARK_LPAREN_IF_ELSE (enable `(?(...)then|else)`) -_Set in: Perl, Perl_NG, Ruby, Oniguruma_ +_Set in: Oniguruma, Perl, Perl_NG, Ruby_ Enables support for conditional inclusion of subsequent regex patterns based on whether a prior named or numbered capture matched, or based on whether a pattern will @@ -676,7 +676,7 @@ match. This supports many different forms, including: ### 22. ONIG_SYN_OP2_ESC_CAPITAL_K_KEEP (enable `\K`) -_Set in: Perl, Perl_NG, Ruby, Oniguruma_ +_Set in: Oniguruma, Perl, Perl_NG, Ruby_ Enables support for `\K`, which excludes all content before it from the overall regex match (i.e., capture #0). So, for example, pattern `foo\Kbar` would match @@ -687,7 +687,7 @@ regex match (i.e., capture #0). So, for example, pattern `foo\Kbar` would match ### 23. ONIG_SYN_OP2_ESC_CAPITAL_R_GENERAL_NEWLINE (enable `\R`) -_Set in: Perl, Perl_NG, Ruby, Oniguruma_ +_Set in: Oniguruma, Perl, Perl_NG, Ruby_ Enables support for `\R`, the "general newline" shorthand, which matches `(\r\n|[\n\v\f\r\u0085\u2028\u2029])` (obviously, the Unicode values are cannot be @@ -698,7 +698,7 @@ matched in ASCII encodings). ### 24. ONIG_SYN_OP2_ESC_CAPITAL_N_O_SUPER_DOT (enable `\N` and `\O`) -_Set in: Perl, Perl_NG, Oniguruma_ +_Set in: Oniguruma, Perl, Perl_NG_ Enables support for `\N` and `\O`. `\N` is "not a line break," which is much like the standard `.` metacharacter, except that while `.` can be affected by @@ -713,7 +713,7 @@ multi-line mode are enabled or disabled. ### 25. ONIG_SYN_OP2_QMARK_TILDE_ABSENT_GROUP (enable `(?~...)`) -_Set in: Ruby, Oniguruma_ +_Set in: Oniguruma, Ruby_ Enables support for the `(?~r)` "absent operator" syntax, which matches as much as possible as long as the result _doesn't_ match pattern `r`. This is @@ -731,7 +731,7 @@ excellent article about it is [available on Medium](https://medium.com/rubyinsid ### 26. ONIG_SYN_OP2_ESC_X_Y_TEXT_SEGMENT (enable `\X` and `\Y` and `\y`) -_Set in: Perl, Perl_NG, Ruby, Oniguruma_ +_Set in: Oniguruma, Perl, Perl_NG, Ruby_ `\X` is another variation on `.`, designed to support Unicode, in that it matches a full _grapheme cluster_. In Unicode, `à` can be encoded as one code point, @@ -764,7 +764,7 @@ backreferences. ### 28. ONIG_SYN_OP2_QMARK_BRACE_CALLOUT_CONTENTS (enable `(?{...})`) -_Set in: Perl, Perl_NG, Oniguruma_ +_Set in: Oniguruma, Perl, Perl_NG_ Enables support for Perl-style "callouts" — pattern substitutions that result from invoking a callback method. When `(?{foo})` is reached in a pattern, the callback @@ -779,7 +779,7 @@ Full documentation for this advanced feature can be found in the Oniguruma ### 29. ONIG_SYN_OP2_ASTERISK_CALLOUT_NAME (enable `(*name)`) -_Set in: Perl, Perl_NG, Oniguruma_ +_Set in: Oniguruma, Perl, Perl_NG_ Enables support for Perl-style "callouts" — pattern substitutions that result from invoking a callback method. When `(*foo)` is reached in a pattern, the callback @@ -820,7 +820,7 @@ some syntaxes but not in others. ### 0. ONIG_SYN_CONTEXT_INDEP_REPEAT_OPS (independent `?`, `*`, `+`, `{n,m}`) -_Set in: PosixExtended, GnuRegex, Java, Perl, Perl_NG, Ruby, Oniguruma_ +_Set in: Oniguruma, PosixExtended, GnuRegex, Java, Perl, Perl_NG, Ruby_ This flag specifies how to handle operators like `?` and `*` when they aren't directly attached to an operand, as in `^*` or `(*)`: Are they an error, are @@ -830,7 +830,7 @@ determines if they are errors or if they are discarded. ### 1. ONIG_SYN_CONTEXT_INVALID_REPEAT_OPS (error or ignore independent operators) -_Set in: PosixExtended, GnuRegex, Java, Perl, Perl_NG, Ruby, Oniguruma_ +_Set in: Oniguruma, PosixExtended, GnuRegex, Java, Perl, Perl_NG, Ruby_ If ONIG_SYN_CONTEXT_INDEP_REPEAT_OPS is set, this flag controls what happens when independent operators appear in a pattern: If this flag is set, then independent @@ -847,7 +847,7 @@ character will produce an error message. ### 3. ONIG_SYN_ALLOW_INVALID_INTERVAL (allow `{???`) -_Set in: GnuRegex, Java, Perl, Perl_NG, Ruby, Oniguruma_ +_Set in: Oniguruma, GnuRegex, Java, Perl, Perl_NG, Ruby_ This flag, if set, causes an invalid range, like `foo{bar}` or `foo{}`, to be silently discarded, as if `foo` had been written instead. If clear, an invalid @@ -855,7 +855,7 @@ range will produce an error message. ### 4. ONIG_SYN_ALLOW_INTERVAL_LOW_ABBREV (allow `{,n}` to mean `{0,n}`) -_Set in: Ruby, Oniguruma_ +_Set in: Oniguruma, Ruby_ If this flag is set, then `r{,n}` will be treated as equivalent to writing `{0,n}`. If this flag is clear, then `r{,n}` will produce an error message. @@ -876,7 +876,7 @@ No built-in syntax has this flag enabled. ### 6. ONIG_SYN_DIFFERENT_LEN_ALT_LOOK_BEHIND (allow `(?<=a|bc)`) -_Set in: Java, Ruby, Oniguruma_ +_Set in: Oniguruma, Java, Ruby_ If this flag is set, lookbehind patterns with alternate options may have differing lengths among those options. If this flag is clear, lookbehind patterns with options @@ -888,7 +888,7 @@ depend on this rule. ### 7. ONIG_SYN_CAPTURE_ONLY_NAMED_GROUP (prefer `\k<name>` over `\3`) -_Set in: Perl_NG, Ruby, Oniguruma_ +_Set in: Oniguruma, Perl_NG, Ruby_ If this flag is set on the syntax *and* ONIG_OPTION_CAPTURE_GROUP is set when calling Oniguruma, then if a name is used on any capture, all captures must also use names: A @@ -896,20 +896,33 @@ single use of a named capture prohibits the use of numbered captures. ### 8. ONIG_SYN_ALLOW_MULTIPLEX_DEFINITION_NAME (allow `(?<x>)...(?<x>)`) -_Set in: Perl_NG, Ruby, Oniguruma_ +_Set in: Oniguruma, Perl_NG, Ruby_ If this flag is set, multiple capture groups may use the same name. If this flag is clear, then reuse of a name will produce an error message. ### 9. ONIG_SYN_FIXED_INTERVAL_IS_GREEDY_ONLY (`a{n}?` is equivalent to `(?:a{n})?`) -_Set in: Ruby, Oniguruma_ +_Set in: Oniguruma, Ruby_ If this flag is set, then intervals of a fixed size will ignore a lazy (non-greedy) `?` quantifier and treat it as an optional match (an ordinary `r?`), since "match as little as possible" is meaningless for a fixed-size interval. If this flag is clear, then `r{n}?` will mean the same as `r{n}`, and the useless `?` will be discarded. +### 10. ONIG_SYN_ISOLATED_OPTION_CONTINUE_BRANCH (`..(?i)..`) + +_Set in: Perl, Perl_NG, Java_ + +If this flag is set, then an isolated option doesn't break the branch and affects until the end of the group (or end of the pattern). +If this flag is not set, then an isolated option is interpreted as the starting point of a new branch. /a(?i)b|c/ ==> /a(?i:b|c)/ + +### 11. ONIG_SYN_VARIABLE_LEN_LOOK_BEHIND (`(?<=...a+...)`) + +_Set in: Oniguruma, Java_ + +If this flag is set, then a variable length expressions are allowed in look-behind. + ### 20. ONIG_SYN_NOT_NEWLINE_IN_NEGATIVE_CC (add `\n` to `[^...]`) _Set in: Grep_ @@ -921,7 +934,7 @@ only exclude those characters and ranges written in them. ### 21. ONIG_SYN_BACKSLASH_ESCAPE_IN_CC (allow `[...\w...]`) -_Set in: GnuRegex, Java, Perl, Perl_NG, Ruby, Oniguruma_ +_Set in: Oniguruma, GnuRegex, Java, Perl, Perl_NG, Ruby_ If this flag is set, shorthands like `\w` are allowed to describe characters in character classes. If this flag is clear, shorthands like `\w` are treated as a redundantly-escaped @@ -937,7 +950,7 @@ character ranges will produce an error message. ### 23. ONIG_SYN_ALLOW_DOUBLE_RANGE_OP_IN_CC (treat `[0-9-a]` as `[0-9\-a]`) -_Set in: PosixExtended, GnuRegex, Java, Perl, Perl_NG, Ruby, Oniguruma_ +_Set in: Oniguruma, PosixExtended, GnuRegex, Java, Perl, Perl_NG, Ruby_ If this flag is set, then a trailing `-` after a character range will be taken as a literal `-`, as if it had been escaped as `\-`. If this flag is clear, then a trailing @@ -945,7 +958,7 @@ literal `-`, as if it had been escaped as `\-`. If this flag is clear, then a t ### 24. ONIG_SYN_WARN_CC_OP_NOT_ESCAPED (warn on `[[...]` and `[-x]`) -_Set in: Ruby, Oniguruma_ +_Set in: Oniguruma, Ruby_ If this flag is set, Oniguruma will be stricter about warning for bad forms in character classes: `[[...]` will produce a warning, but `[\[...]` will not; @@ -955,7 +968,7 @@ will be silently discarded. ### 25. ONIG_SYN_WARN_REDUNDANT_NESTED_REPEAT (warn on `(?:a*)+`) -_Set in: Ruby, Oniguruma_ +_Set in: Oniguruma, Ruby_ If this flag is set, Oniguruma will warn about nested repeat operators those have no meaning, like `(?:a*)+`. If this flag is clear, Oniguruma will allow the nested repeat operators without warning about them. @@ -968,7 +981,7 @@ If this flag is set, then invalid code points at the end of range in character c ### 31. ONIG_SYN_CONTEXT_INDEP_ANCHORS -_Set in: PosixExtended, GnuRegex, Java, Perl, Perl_NG, Ruby, Oniguruma_ +_Set in: Oniguruma, PosixExtended, GnuRegex, Java, Perl, Perl_NG, Ruby_ Not currently used, and does nothing. (But still set in several syntaxes for some reason.) @@ -1062,10 +1075,12 @@ These tables show which of the built-in syntaxes use which flags and options, fo | 3 | `ONIG_SYN_ALLOW_INVALID_INTERVAL` | - | - | - | - | Yes | Yes | Yes | Yes | Yes | Yes | | 4 | `ONIG_SYN_ALLOW_INTERVAL_LOW_ABBREV` | - | - | - | - | - | - | - | - | Yes | Yes | | 5 | `ONIG_SYN_STRICT_CHECK_BACKREF` | - | - | - | - | - | - | - | - | - | - | -| 6 | `ONIG_SYN_DIFFERENT_LEN_ALT_LOOK_BEHIND` | - | - | - | - | - | - | - | Yes | Yes | Yes | +| 6 | `ONIG_SYN_DIFFERENT_LEN_ALT_LOOK_BEHIND` | - | - | - | - | - | Yes | - | - | Yes | Yes | | 7 | `ONIG_SYN_CAPTURE_ONLY_NAMED_GROUP` | - | - | - | - | - | - | - | Yes | Yes | Yes | | 8 | `ONIG_SYN_ALLOW_MULTIPLEX_DEFINITION_NAME` | - | - | - | - | - | - | - | Yes | Yes | Yes | | 9 | `ONIG_SYN_FIXED_INTERVAL_IS_GREEDY_ONLY` | - | - | - | - | - | - | - | - | Yes | Yes | +| 10 | `ONIG_SYN_ISOLATED_OPTION_CONTINUE_BRANCH` | - | - | - | - | - | Yes | Yes | Yes | - | - | +| 11 | `ONIG_SYN_VARIABLE_LEN_LOOK_BEHIND` | - | - | - | - | - | Yes | - | - | - | Yes | | 20 | `ONIG_SYN_NOT_NEWLINE_IN_NEGATIVE_CC` | - | - | - | Yes | - | - | - | - | - | - | | 21 | `ONIG_SYN_BACKSLASH_ESCAPE_IN_CC` | - | - | - | - | Yes | Yes | Yes | Yes | Yes | Yes | | 22 | `ONIG_SYN_ALLOW_EMPTY_RANGE_IN_CC` | - | - | Yes | Yes | - | - | - | - | - | - | |