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didHd�ZdId � ZdJadjdKd�ZdkdLd�ZdldMd�Zd:d;ljZd:d;ljZd:dNlmZ d:dOlm Z d:dPlT d:dQlm Z m Z m Z m!Z!m"Z"m#Z#m$Z$m%Z%m&Z&m'Z'm(Z(m)Z) d:dRlm*Z+m,Z-m.Z/m0Z1m2Z3 e4a5e6dS�Z7t5e_5i Z8e� Z9i Z:i Z;i Z<dTZ=dTZ>dUdV� Z?dWdX� Z@e?dYd:d<i d<�ZAeBeA�ZCeBeAjdY��ZD[AejEdZ� ejEd[� eZFd:d;lGZHd\d]� ZIeHjJeCeI� d;S )ma�/ Support for regular expressions (RE).
This module provides regular expression matching operations similar to those
found in Perl. It supports both 8-bit and Unicode strings; both the pattern and
the strings being processed can contain null bytes and characters outside the
US ASCII range.
Regular expressions can contain both special and ordinary characters. Most
ordinary characters, like "A", "a", or "0", are the simplest regular
expressions; they simply match themselves. You can concatenate ordinary
characters, so last matches the string 'last'.
There are a few differences between the old (legacy) behaviour and the new
(enhanced) behaviour, which are indicated by VERSION0 or VERSION1.
The special characters are:
"." Matches any character except a newline.
"^" Matches the start of the string.
"$" Matches the end of the string or just before the
newline at the end of the string.
"*" Matches 0 or more (greedy) repetitions of the preceding
RE. Greedy means that it will match as many repetitions
as possible.
"+" Matches 1 or more (greedy) repetitions of the preceding
RE.
"?" Matches 0 or 1 (greedy) of the preceding RE.
*?,+?,?? Non-greedy versions of the previous three special
characters.
*+,++,?+ Possessive versions of the previous three special
characters.
{m,n} Matches from m to n repetitions of the preceding RE.
{m,n}? Non-greedy version of the above.
{m,n}+ Possessive version of the above.
{...} Fuzzy matching constraints.
"\\" Either escapes special characters or signals a special
sequence.
[...] Indicates a set of characters. A "^" as the first
character indicates a complementing set.
"|" A|B, creates an RE that will match either A or B.
(...) Matches the RE inside the parentheses. The contents are
captured and can be retrieved or matched later in the
string.
(?flags-flags) VERSION1: Sets/clears the flags for the remainder of
the group or pattern; VERSION0: Sets the flags for the
entire pattern.
(?:...) Non-capturing version of regular parentheses.
(?>...) Atomic non-capturing version of regular parentheses.
(?flags-flags:...) Non-capturing version of regular parentheses with local
flags.
(?P<name>...) The substring matched by the group is accessible by
name.
(?<name>...) The substring matched by the group is accessible by
name.
(?P=name) Matches the text matched earlier by the group named
name.
(?#...) A comment; ignored.
(?=...) Matches if ... matches next, but doesn't consume the
string.
(?!...) Matches if ... doesn't match next.
(?<=...) Matches if preceded by ....
(?<!...) Matches if not preceded by ....
(?(id)yes|no) Matches yes pattern if group id matched, the (optional)
no pattern otherwise.
(?(DEFINE)...) If there's no group called "DEFINE", then ... will be
ignored, but any group definitions will be available.
(?|...|...) (?|A|B), creates an RE that will match either A or B,
but reuses capture group numbers across the
alternatives.
(*FAIL) Forces matching to fail, which means immediate
backtracking.
(*F) Abbreviation for (*FAIL).
(*PRUNE) Discards the current backtracking information. Its
effect doesn't extend outside an atomic group or a
lookaround.
(*SKIP) Similar to (*PRUNE), except that it also sets where in
the text the next attempt at matching the entire
pattern will start. Its effect doesn't extend outside
an atomic group or a lookaround.
The fuzzy matching constraints are: "i" to permit insertions, "d" to permit
deletions, "s" to permit substitutions, "e" to permit any of these. Limits are
optional with "<=" and "<". If any type of error is provided then any type not
provided is not permitted.
A cost equation may be provided.
Examples:
(?:fuzzy){i<=2}
(?:fuzzy){i<=1,s<=2,d<=1,1i+1s+1d<3}
VERSION1: Set operators are supported, and a set can include nested sets. The
set operators, in order of increasing precedence, are:
|| Set union ("x||y" means "x or y").
~~ (double tilde) Symmetric set difference ("x~~y" means "x or y, but not
both").
&& Set intersection ("x&&y" means "x and y").
-- (double dash) Set difference ("x--y" means "x but not y").
Implicit union, ie, simple juxtaposition like in [ab], has the highest
precedence.
VERSION0 and VERSION1:
The special sequences consist of "\\" and a character from the list below. If
the ordinary character is not on the list, then the resulting RE will match the
second character.
\number Matches the contents of the group of the same number if
number is no more than 2 digits, otherwise the character
with the 3-digit octal code.
\a Matches the bell character.
\A Matches only at the start of the string.
\b Matches the empty string, but only at the start or end of a
word.
\B Matches the empty string, but not at the start or end of a
word.
\d Matches any decimal digit; equivalent to the set [0-9] when
matching a bytestring or a Unicode string with the ASCII
flag, or the whole range of Unicode digits when matching a
Unicode string.
\D Matches any non-digit character; equivalent to [^\d].
\f Matches the formfeed character.
\g<name> Matches the text matched by the group named name.
\G Matches the empty string, but only at the position where
the search started.
\h Matches horizontal whitespace.
\K Keeps only what follows for the entire match.
\L<name> Named list. The list is provided as a keyword argument.
\m Matches the empty string, but only at the start of a word.
\M Matches the empty string, but only at the end of a word.
\n Matches the newline character.
\N{name} Matches the named character.
\p{name=value} Matches the character if its property has the specified
value.
\P{name=value} Matches the character if its property hasn't the specified
value.
\r Matches the carriage-return character.
\s Matches any whitespace character; equivalent to
[ \t\n\r\f\v].
\S Matches any non-whitespace character; equivalent to [^\s].
\t Matches the tab character.
\uXXXX Matches the Unicode codepoint with 4-digit hex code XXXX.
\UXXXXXXXX Matches the Unicode codepoint with 8-digit hex code
XXXXXXXX.
\v Matches the vertical tab character.
\w Matches any alphanumeric character; equivalent to
[a-zA-Z0-9_] when matching a bytestring or a Unicode string
with the ASCII flag, or the whole range of Unicode
alphanumeric characters (letters plus digits plus
underscore) when matching a Unicode string. With LOCALE, it
will match the set [0-9_] plus characters defined as
letters for the current locale.
\W Matches the complement of \w; equivalent to [^\w].
\xXX Matches the character with 2-digit hex code XX.
\X Matches a grapheme.
\Z Matches only at the end of the string.
\\ Matches a literal backslash.
This module exports the following functions:
match Match a regular expression pattern at the beginning of a string.
fullmatch Match a regular expression pattern against all of a string.
search Search a string for the presence of a pattern.
sub Substitute occurrences of a pattern found in a string using a
template string.
subf Substitute occurrences of a pattern found in a string using a
format string.
subn Same as sub, but also return the number of substitutions made.
subfn Same as subf, but also return the number of substitutions made.
split Split a string by the occurrences of a pattern. VERSION1: will
split at zero-width match; VERSION0: won't split at zero-width
match.
splititer Return an iterator yielding the parts of a split string.
findall Find all occurrences of a pattern in a string.
finditer Return an iterator yielding a match object for each match.
compile Compile a pattern into a Pattern object.
purge Clear the regular expression cache.
escape Backslash all non-alphanumerics or special characters in a
string.
Most of the functions support a concurrent parameter: if True, the GIL will be
released during matching, allowing other Python threads to run concurrently. If
the string changes during matching, the behaviour is undefined. This parameter
is not needed when working on the builtin (immutable) string classes.
Some of the functions in this module take flags as optional parameters. Most of
these flags can also be set within an RE:
A a ASCII Make \w, \W, \b, \B, \d, and \D match the
corresponding ASCII character categories. Default
when matching a bytestring.
B b BESTMATCH Find the best fuzzy match (default is first).
D DEBUG Print the parsed pattern.
E e ENHANCEMATCH Attempt to improve the fit after finding the first
fuzzy match.
F f FULLCASE Use full case-folding when performing
case-insensitive matching in Unicode.
I i IGNORECASE Perform case-insensitive matching.
L L LOCALE Make \w, \W, \b, \B, \d, and \D dependent on the
current locale. (One byte per character only.)
M m MULTILINE "^" matches the beginning of lines (after a newline)
as well as the string. "$" matches the end of lines
(before a newline) as well as the end of the string.
P p POSIX Perform POSIX-standard matching (leftmost longest).
R r REVERSE Searches backwards.
S s DOTALL "." matches any character at all, including the
newline.
U u UNICODE Make \w, \W, \b, \B, \d, and \D dependent on the
Unicode locale. Default when matching a Unicode
string.
V0 V0 VERSION0 Turn on the old legacy behaviour.
V1 V1 VERSION1 Turn on the new enhanced behaviour. This flag
includes the FULLCASE flag.
W w WORD Make \b and \B work with default Unicode word breaks
and make ".", "^" and "$" work with Unicode line
breaks.
X x VERBOSE Ignore whitespace and comments for nicer looking REs.
This module also defines an exception 'error'.
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